21123202110 has 16 divisors (see below), whose sum is σ = 50695685136. Its totient is φ = 5632853888.

The previous prime is 21123202081. The next prime is 21123202123. The reversal of 21123202110 is 1120232112.

21123202110 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21123202110.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 352053339 + ... + 352053398.

It is an arithmetic number, because the mean of its divisors is an integer number (3168480321).

Almost surely, 2^21123202110 is an apocalyptic number.

21123202110 is an abundant number, since it is smaller than the sum of its proper divisors (29572483026).

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

21123202110 is a wasteful number, since it uses less digits than its factorization.

21123202110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704106747.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21123202110 its reverse (1120232112), we get a palindrome (22243434222).

The spelling of 21123202110 in words is "twenty-one billion, one hundred twenty-three million, two hundred two thousand, one hundred ten".