21171802292 has 12 divisors (see below), whose sum is σ = 38328262980. Its totient is φ = 10220870016.

The previous prime is 21171802271. The next prime is 21171802339. The reversal of 21171802292 is 29220817112.

It can be written as a sum of positive squares in 2 ways, for example, as 15105884836 + 6065917456 = 122906^2 + 77884^2 .

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, 91257653 + ... + 91257884.

It is an arithmetic number, because the mean of its divisors is an integer number (3194021915).

Almost surely, 2^21171802292 is an apocalyptic number.

It is an amenable number.

21171802292 is a deficient number, since it is larger than the sum of its proper divisors (17156460688).

21171802292 is a wasteful number, since it uses less digits than its factorization.

21171802292 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182515570 (or 182515568 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 35.

The spelling of 21171802292 in words is "twenty-one billion, one hundred seventy-one million, eight hundred two thousand, two hundred ninety-two".