21522131432 has 16 divisors (see below), whose sum is σ = 40587259140. Its totient is φ = 10698862336.

The previous prime is 21522131417. The next prime is 21522131471. The reversal of 21522131432 is 23413122512.

It can be written as a sum of positive squares in 2 ways, for example, as 21489800836 + 32330596 = 146594^2 + 5686^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7773953 + ... + 7776720.

Almost surely, 2^21522131432 is an apocalyptic number.

It is an amenable number.

21522131432 is a deficient number, since it is larger than the sum of its proper divisors (19065127708).

21522131432 is a wasteful number, since it uses less digits than its factorization.

21522131432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15550852 (or 15550848 counting only the distinct ones).

The product of its digits is 2880, while the sum is 26.

Adding to 21522131432 its reverse (23413122512), we get a palindrome (44935253944).

The spelling of 21522131432 in words is "twenty-one billion, five hundred twenty-two million, one hundred thirty-one thousand, four hundred thirty-two".