21271057202 has 12 divisors (see below), whose sum is σ = 33354145230. Its totient is φ = 10173113808.

The previous prime is 21271057183. The next prime is 21271057229. The reversal of 21271057202 is 20275017212.

It can be written as a sum of positive squares in only one way, i.e., 20053675321 + 1217381881 = 141611^2 + 34891^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10051427 + ... + 10053542.

Almost surely, 2^21271057202 is an apocalyptic number.

21271057202 is a deficient number, since it is larger than the sum of its proper divisors (12083088028).

21271057202 is a wasteful number, since it uses less digits than its factorization.

21271057202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20105017 (or 20104994 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 29.

The spelling of 21271057202 in words is "twenty-one billion, two hundred seventy-one million, fifty-seven thousand, two hundred two".