18971971212 has 24 divisors (see below), whose sum is σ = 44304825712. Its totient is φ = 6318720000.

The previous prime is 18971971211. The next prime is 18971971231. The reversal of 18971971212 is 21217917981.

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, 643789 + ... + 672612.

Almost surely, 2^18971971212 is an apocalyptic number.

18971971212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18971971212 is an abundant number, since it is smaller than the sum of its proper divisors (25332854500).

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

18971971212 is a wasteful number, since it uses less digits than its factorization.

18971971212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1317609 (or 1317607 counting only the distinct ones).

The product of its digits is 127008, while the sum is 48.

The spelling of 18971971212 in words is "eighteen billion, nine hundred seventy-one million, nine hundred seventy-one thousand, two hundred twelve".