18971971210 has 16 divisors (see below), whose sum is σ = 34177630536. Its totient is φ = 7582547968.

The previous prime is 18971971189. The next prime is 18971971211. The reversal of 18971971210 is 1217917981.

It can be written as a sum of positive squares in 4 ways, for example, as 7123866409 + 11848104801 = 84403^2 + 108849^2 .

It is not an unprimeable number, because it can be changed into a prime (18971971211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 767287 + ... + 791626.

Almost surely, 2^18971971210 is an apocalyptic number.

18971971210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18971971210 is a deficient number, since it is larger than the sum of its proper divisors (15205659326).

18971971210 is a wasteful number, since it uses less digits than its factorization.

18971971210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1560137.

The product of its (nonzero) digits is 63504, while the sum is 46.

The spelling of 18971971210 in words is "eighteen billion, nine hundred seventy-one million, nine hundred seventy-one thousand, two hundred ten".