21622206755172 has 48 divisors (see below), whose sum is σ = 51823495241280. Its totient is φ = 7011509069952.

The previous prime is 21622206755137. The next prime is 21622206755173. The reversal of 21622206755172 is 27155760222612.

It is not an unprimeable number, because it can be changed into a prime (21622206755173) 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, 974418 + ... + 6647849.

It is an arithmetic number, because the mean of its divisors is an integer number (1079656150860).

Almost surely, 2^{21622206755172} is an apocalyptic number.

It is an amenable number.

21622206755172 is an abundant number, since it is smaller than the sum of its proper divisors (30201288486108).

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

21622206755172 is a wasteful number, since it uses less digits than its factorization.

21622206755172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7628700 (or 7628698 counting only the distinct ones).

The product of its (nonzero) digits is 1411200, while the sum is 48.

Adding to 21622206755172 its reverse (27155760222612), we get a palindrome (48777966977784).

The spelling of 21622206755172 in words is "twenty-one trillion, six hundred twenty-two billion, two hundred six million, seven hundred fifty-five thousand, one hundred seventy-two".