21121001112210 has 64 divisors (see below), whose sum is σ = 54063959058432. Its totient is φ = 5262264006656.

The previous prime is 21121001112173. The next prime is 21121001112223. The reversal of 21121001112210 is 1221110012112.

It is a happy number.

It is a super-2 number, since 2×21121001112210² (a number of 27 digits) contains 22 as substring.

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 21121001112210.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 151075122 + ... + 151214861.

It is an arithmetic number, because the mean of its divisors is an integer number (844749360288).

Almost surely, 2^{21121001112210} is an apocalyptic number.

21121001112210 is an abundant number, since it is smaller than the sum of its proper divisors (32942957946222).

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

21121001112210 is a wasteful number, since it uses less digits than its factorization.

21121001112210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302290147.

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

Adding to 21121001112210 its reverse (1221110012112), we get a palindrome (22342111124322).

The spelling of 21121001112210 in words is "twenty-one trillion, one hundred twenty-one billion, one million, one hundred twelve thousand, two hundred ten".