21011122110 has 32 divisors (see below), whose sum is σ = 55010938752. Its totient is φ = 5093605280.

The previous prime is 21011122091. The next prime is 21011122141. The reversal of 21011122110 is 1122111012.

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 15 ways as a sum of consecutive naturals, for example, 31834704 + ... + 31835363.

It is an arithmetic number, because the mean of its divisors is an integer number (1719091836).

Almost surely, 2^21011122110 is an apocalyptic number.

21011122110 is an abundant number, since it is smaller than the sum of its proper divisors (33999816642).

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

21011122110 is a wasteful number, since it uses less digits than its factorization.

21011122110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63670088.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21011122110 its reverse (1122111012), we get a palindrome (22133233122).

It can be divided in two parts, 210111 and 22110, that added together give a triangular number (232221 = T₆₈₁).

The spelling of 21011122110 in words is "twenty-one billion, eleven million, one hundred twenty-two thousand, one hundred ten".