21102210000 has 300 divisors, whose sum is σ = 75803963092. Its totient is φ = 5474304000.

The previous prime is 21102209959. The next prime is 21102210011. The reversal of 21102210000 is 1220112.

It can be written as a sum of positive squares in 10 ways, for example, as 13320853056 + 7781356944 = 115416^2 + 88212^2 .

It is a tau number, because it is divible by the number of its divisors (300).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 3326832 + ... + 3333168.

Almost surely, 2^21102210000 is an apocalyptic number.

21102210000 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 21102210000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37901981546).

21102210000 is an abundant number, since it is smaller than the sum of its proper divisors (54701753092).

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

21102210000 is a wasteful number, since it uses less digits than its factorization.

21102210000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6408 (or 6384 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 21102210000 its reverse (1220112), we get a palindrome (21103430112).

The spelling of 21102210000 in words is "twenty-one billion, one hundred two million, two hundred ten thousand".