21121202122110 has 48 divisors (see below), whose sum is σ = 54915368363856. Its totient is φ = 5632295658624.

The previous prime is 21121202122093. The next prime is 21121202122123. The reversal of 21121202122110 is 1122120212112.

21121202122110 is a `hidden beast` number, since 211 + 21 + 202 + 1 + 221 + 10 = 666.

It is a super-2 number, since 2×21121202122110² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

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, 29612802 + ... + 30317658.

It is an arithmetic number, because the mean of its divisors is an integer number (1144070174247).

Almost surely, 2^{21121202122110} is an apocalyptic number.

21121202122110 is an abundant number, since it is smaller than the sum of its proper divisors (33794166241746).

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

21121202122110 is a wasteful number, since it uses less digits than its factorization.

21121202122110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1037817 (or 1037814 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21121202122110 its reverse (1122120212112), we get a palindrome (22243322334222).

The spelling of 21121202122110 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred two million, one hundred twenty-two thousand, one hundred ten".