217992899227912 has 128 divisors (see below), whose sum is σ = 447851964211200. Its totient is φ = 99156861619200.

The previous prime is 217992899227897. The next prime is 217992899227951. The reversal of 217992899227912 is 219722998299712.

It is a super-2 number, since 2×217992899227912² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1244085987 + ... + 1244261197.

It is an arithmetic number, because the mean of its divisors is an integer number (3498843470400).

Almost surely, 2^{217992899227912} is an apocalyptic number.

It is an amenable number.

217992899227912 is an abundant number, since it is smaller than the sum of its proper divisors (229859064983288).

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

217992899227912 is a wasteful number, since it uses less digits than its factorization.

217992899227912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179027 (or 179023 counting only the distinct ones).

The product of its digits is 740710656, while the sum is 79.

The spelling of 217992899227912 in words is "two hundred seventeen trillion, nine hundred ninety-two billion, eight hundred ninety-nine million, two hundred twenty-seven thousand, nine hundred twelve".