21021110102110 has 32 divisors (see below), whose sum is σ = 39147034449600. Its totient is φ = 8117610466560.

The previous prime is 21021110101949. The next prime is 21021110102123. The reversal of 21021110102110 is 1120101112012.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1299570 + ... + 6612949.

It is an arithmetic number, because the mean of its divisors is an integer number (1223344826550).

Almost surely, 2^{21021110102110} is an apocalyptic number.

21021110102110 is a deficient number, since it is larger than the sum of its proper divisors (18125924347490).

21021110102110 is a wasteful number, since it uses less digits than its factorization.

21021110102110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7921716.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21021110102110 its reverse (1120101112012), we get a palindrome (22141211214122).

The spelling of 21021110102110 in words is "twenty-one trillion, twenty-one billion, one hundred ten million, one hundred two thousand, one hundred ten".