21292137088 has 32 divisors (see below), whose sum is σ = 42475985460. Its totient is φ = 10631497728.

The previous prime is 21292137077. The next prime is 21292137089. The reversal of 21292137088 is 88073129212.

It can be written as a sum of positive squares in 2 ways, for example, as 13048949824 + 8243187264 = 114232^2 + 90792^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (21292137089) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19645 + ... + 207292.

Almost surely, 2^21292137088 is an apocalyptic number.

It is an amenable number.

21292137088 is a deficient number, since it is larger than the sum of its proper divisors (21183848372).

21292137088 is an equidigital number, since it uses as much as digits as its factorization.

21292137088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227684 (or 227672 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 43.

The spelling of 21292137088 in words is "twenty-one billion, two hundred ninety-two million, one hundred thirty-seven thousand, eighty-eight".