21012113211100 has 72 divisors (see below), whose sum is σ = 49742128800000. Its totient is φ = 7640656881600.

The previous prime is 21012113211097. The next prime is 21012113211113. The reversal of 21012113211100 is 111231121012.

It is a happy number.

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 23 ways as a sum of consecutive naturals, for example, 132909901 + ... + 133067899.

It is an arithmetic number, because the mean of its divisors is an integer number (690862900000).

Almost surely, 2^{21012113211100} is an apocalyptic number.

21012113211100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21012113211100 is an abundant number, since it is smaller than the sum of its proper divisors (28730015588900).

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

21012113211100 is a wasteful number, since it uses less digits than its factorization.

21012113211100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278923 (or 278916 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 21012113211100 its reverse (111231121012), we get a palindrome (21123344332112).

The spelling of 21012113211100 in words is "twenty-one trillion, twelve billion, one hundred thirteen million, two hundred eleven thousand, one hundred".