21111202120100 has 72 divisors (see below), whose sum is σ = 47394313444800. Its totient is φ = 8152723331200.

The previous prime is 21111202120087. The next prime is 21111202120109. The reversal of 21111202120100 is 102120211112.

It is not an unprimeable number, because it can be changed into a prime (21111202120109) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 42589481 + ... + 43082319.

It is an arithmetic number, because the mean of its divisors is an integer number (658254353400).

Almost surely, 2^{21111202120100} is an apocalyptic number.

21111202120100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21111202120100 is an abundant number, since it is smaller than the sum of its proper divisors (26283111324700).

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

21111202120100 is a wasteful number, since it uses less digits than its factorization.

21111202120100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 507653 (or 507646 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21111202120100 its reverse (102120211112), we get a palindrome (21213322331212).

The spelling of 21111202120100 in words is "twenty-one trillion, one hundred eleven billion, two hundred two million, one hundred twenty thousand, one hundred".