21222052315156 has 96 divisors (see below), whose sum is σ = 46369832850432. Its totient is φ = 8256343011840.

The previous prime is 21222052315147. The next prime is 21222052315223. The reversal of 21222052315156 is 65151325022212.

It is a congruent number.

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, 1005440355 + ... + 1005461461.

It is an arithmetic number, because the mean of its divisors is an integer number (483019092192).

Almost surely, 2^{21222052315156} is an apocalyptic number.

It is an amenable number.

21222052315156 is an abundant number, since it is smaller than the sum of its proper divisors (25147780535276).

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

21222052315156 is a wasteful number, since it uses less digits than its factorization.

21222052315156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25709 (or 25707 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 37.

Adding to 21222052315156 its reverse (65151325022212), we get a palindrome (86373377337368).

The spelling of 21222052315156 in words is "twenty-one trillion, two hundred twenty-two billion, fifty-two million, three hundred fifteen thousand, one hundred fifty-six".