21120212122100 has 72 divisors (see below), whose sum is σ = 56407212707328. Its totient is φ = 6684198998400.

The previous prime is 21120212122021. The next prime is 21120212122123. The reversal of 21120212122100 is 122121202112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1160442116 + ... + 1160460315.

It is an arithmetic number, because the mean of its divisors is an integer number (783433509824).

Almost surely, 2^{21120212122100} is an apocalyptic number.

21120212122100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21120212122100 is an abundant number, since it is smaller than the sum of its proper divisors (35287000585228).

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

21120212122100 is a wasteful number, since it uses less digits than its factorization.

21120212122100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2320902465 (or 2320902458 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21120212122100 its reverse (122121202112), we get a palindrome (21242333324212).

The spelling of 21120212122100 in words is "twenty-one trillion, one hundred twenty billion, two hundred twelve million, one hundred twenty-two thousand, one hundred".