21122015432 has 32 divisors (see below), whose sum is σ = 47923902720. Its totient is φ = 8519804160.

The previous prime is 21122015417. The next prime is 21122015441. The reversal of 21122015432 is 23451022112.

It is a super-2 number, since 2×21122015432² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21122015398 and 21122015407.

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, 11092544 + ... + 11094447.

It is an arithmetic number, because the mean of its divisors is an integer number (1497621960).

Almost surely, 2^21122015432 is an apocalyptic number.

It is an amenable number.

21122015432 is an abundant number, since it is smaller than the sum of its proper divisors (26801887288).

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

21122015432 is a wasteful number, since it uses less digits than its factorization.

21122015432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22187021 (or 22187017 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 21122015432 its reverse (23451022112), we get a palindrome (44573037544).

The spelling of 21122015432 in words is "twenty-one billion, one hundred twenty-two million, fifteen thousand, four hundred thirty-two".