213172202540 has 36 divisors (see below), whose sum is σ = 492057825168. Its totient is φ = 77517163680.

The previous prime is 213172202417. The next prime is 213172202587. The reversal of 213172202540 is 45202271312.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44041424 + ... + 44046263.

Almost surely, 2^213172202540 is an apocalyptic number.

213172202540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213172202540 is an abundant number, since it is smaller than the sum of its proper divisors (278885622628).

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

213172202540 is a wasteful number, since it uses less digits than its factorization.

213172202540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88087718 (or 88087705 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 29.

Adding to 213172202540 its reverse (45202271312), we get a palindrome (258374473852).

The spelling of 213172202540 in words is "two hundred thirteen billion, one hundred seventy-two million, two hundred two thousand, five hundred forty".