21011122021110 has 32 divisors (see below), whose sum is σ = 54305669224800. Its totient is φ = 5171968497408.

The previous prime is 21011122021091. The next prime is 21011122021133. The reversal of 21011122021110 is 1112022111012.

It is a happy number.

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 21011122021110.

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, 26937335535 + ... + 26937336314.

It is an arithmetic number, because the mean of its divisors is an integer number (1697052163275).

Almost surely, 2^{21011122021110} is an apocalyptic number.

21011122021110 is an abundant number, since it is smaller than the sum of its proper divisors (33294547203690).

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

21011122021110 is a wasteful number, since it uses less digits than its factorization.

21011122021110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53874671872.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21011122021110 its reverse (1112022111012), we get a palindrome (22123144132122).

The spelling of 21011122021110 in words is "twenty-one trillion, eleven billion, one hundred twenty-two million, twenty-one thousand, one hundred ten".