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21111222000 = 24353111013167
BaseRepresentation
bin10011101010010100…
…111010111011110000
32000111021111012021010
4103222110322323300
5321213433101000
613410502430520
71345104266121
oct235224727360
960437435233
1021111222000
118a53809610
124112132440
131cb598744b
141043b06048
158385bbd50
hex4ea53aef0

21111222000 has 320 divisors, whose sum is σ = 75008913408. Its totient is φ = 5065600000.

The previous prime is 21111221983. The next prime is 21111222019. The reversal of 21111222000 is 22211112.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6664417 + ... + 6667583.

Almost surely, 221111222000 is an apocalyptic number.

21111222000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21111222000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37504456704).

21111222000 is an abundant number, since it is smaller than the sum of its proper divisors (53897691408).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21111222000 is a wasteful number, since it uses less digits than its factorization.

21111222000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3305 (or 3289 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21111222000 its reverse (22211112), we get a palindrome (21133433112).

It can be divided in two parts, 211 and 11222000, that added together give a palindrome (11222211).

The spelling of 21111222000 in words is "twenty-one billion, one hundred eleven million, two hundred twenty-two thousand".