21122021022210 has 96 divisors (see below), whose sum is σ = 56873595579840. Its totient is φ = 5432316914304.

The previous prime is 21122021022199. The next prime is 21122021022211. The reversal of 21122021022210 is 1222012022112.

It is a happy number.

21122021022210 is a `hidden beast` number, since 2 + 1 + 1 + 220 + 210 + 22 + 210 = 666.

It is a super-2 number, since 2×21122021022210² (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 not an unprimeable number, because it can be changed into a prime (21122021022211) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2093992 + ... + 6828531.

It is an arithmetic number, because the mean of its divisors is an integer number (592433287290).

Almost surely, 2^{21122021022210} is an apocalyptic number.

21122021022210 is an abundant number, since it is smaller than the sum of its proper divisors (35751574557630).

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

21122021022210 is a wasteful number, since it uses less digits than its factorization.

21122021022210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8923472 (or 8923469 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21122021022210 its reverse (1222012022112), we get a palindrome (22344033044322).

The spelling of 21122021022210 in words is "twenty-one trillion, one hundred twenty-two billion, twenty-one million, twenty-two thousand, two hundred ten".