21201111220122 has 32 divisors (see below), whose sum is σ = 47113740495360. Its totient is φ = 7067013072480.

The previous prime is 21201111220111. The next prime is 21201111220127. The reversal of 21201111220122 is 22102211110212.

21201111220122 is a `hidden beast` number, since 212 + 0 + 1 + 111 + 220 + 122 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 21201111220095 and 21201111220104.

It is not an unprimeable number, because it can be changed into a prime (21201111220127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23256247 + ... + 24150677.

It is an arithmetic number, because the mean of its divisors is an integer number (1472304390480).

Almost surely, 2^{21201111220122} is an apocalyptic number.

21201111220122 is an abundant number, since it is smaller than the sum of its proper divisors (25912629275238).

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

21201111220122 is a wasteful number, since it uses less digits than its factorization.

21201111220122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1333395 (or 1333389 counting only the distinct ones).

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

Adding to 21201111220122 its reverse (22102211110212), we get a palindrome (43303322330334).

The spelling of 21201111220122 in words is "twenty-one trillion, two hundred one billion, one hundred eleven million, two hundred twenty thousand, one hundred twenty-two".