21011210002100 has 36 divisors (see below), whose sum is σ = 45596337691884. Its totient is φ = 8404113127680.

The previous prime is 21011210002093. The next prime is 21011210002103. The reversal of 21011210002100 is 120001211012.

It can be written as a sum of positive squares in 6 ways, for example, as 2107827770896 + 18903382231204 = 1451836^2 + 4347802^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011210002103) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 2352857 + ... + 6896256.

Almost surely, 2^{21011210002100} is an apocalyptic number.

21011210002100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21011210002100 is an abundant number, since it is smaller than the sum of its proper divisors (24585127689784).

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

21011210002100 is a wasteful number, since it uses less digits than its factorization.

21011210002100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9271844 (or 9271837 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21011210002100 its reverse (120001211012), we get a palindrome (21131211213112).

The spelling of 21011210002100 in words is "twenty-one trillion, eleven billion, two hundred ten million, two thousand, one hundred".