21220212111000 has 384 divisors, whose sum is σ = 79857220584960. Its totient is φ = 4595051808000.

The previous prime is 21220212110971. The next prime is 21220212111011. The reversal of 21220212111000 is 11121202212.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 6181435 + ... + 8980565.

It is an arithmetic number, because the mean of its divisors is an integer number (207961511940).

Almost surely, 2^{21220212111000} is an apocalyptic number.

21220212111000 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 21220212111000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39928610292480).

21220212111000 is an abundant number, since it is smaller than the sum of its proper divisors (58637008473960).

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

21220212111000 is a wasteful number, since it uses less digits than its factorization.

21220212111000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2799200 (or 2799167 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21220212111000 its reverse (11121202212), we get a palindrome (21231333313212).

The spelling of 21220212111000 in words is "twenty-one trillion, two hundred twenty billion, two hundred twelve million, one hundred eleven thousand".