21118497332 has 12 divisors (see below), whose sum is σ = 37463636196. Its totient is φ = 10414601280.

The previous prime is 21118497311. The next prime is 21118497349. The reversal of 21118497332 is 23379481112.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 13723185316 + 7395312016 = 117146^2 + 85996^2 .

It is a super-2 number, since 2×21118497332² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21118497332.

It is a congruent number.

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, 36161519 + ... + 36162102.

It is an arithmetic number, because the mean of its divisors is an integer number (3121969683).

Almost surely, 2^21118497332 is an apocalyptic number.

It is an amenable number.

21118497332 is a deficient number, since it is larger than the sum of its proper divisors (16345138864).

21118497332 is a wasteful number, since it uses less digits than its factorization.

21118497332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72323698 (or 72323696 counting only the distinct ones).

The product of its digits is 72576, while the sum is 41.

The spelling of 21118497332 in words is "twenty-one billion, one hundred eighteen million, four hundred ninety-seven thousand, three hundred thirty-two".