21122122112 has 64 divisors (see below), whose sum is σ = 51789847200. Its totient is φ = 8355999744.

The previous prime is 21122122097. The next prime is 21122122123.

21122122112 is nontrivially palindromic in base 10.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×21122122112² (a number of 21 digits) contains 22 as substring.

It is a nude number because it is divisible by every one of its digits and also a Zuckerman number because it is divisible by the product of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 895037 + ... + 918332.

Almost surely, 2^21122122112 is an apocalyptic number.

It is an amenable number.

21122122112 is an abundant number, since it is smaller than the sum of its proper divisors (30667725088).

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

21122122112 is a wasteful number, since it uses less digits than its factorization.

21122122112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1813403 (or 1813391 counting only the distinct ones).

The product of its digits is 64, while the sum is 17.

The spelling of 21122122112 in words is "twenty-one billion, one hundred twenty-two million, one hundred twenty-two thousand, one hundred twelve".