212161655612 has 12 divisors (see below), whose sum is σ = 371338583616. Its totient is φ = 106064917440.

The previous prime is 212161655609. The next prime is 212161655659. The reversal of 212161655612 is 216556161212.

It is a super-2 number, since 2×212161655612² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3947564 + ... + 4000947.

It is an arithmetic number, because the mean of its divisors is an integer number (30944881968).

Almost surely, 2^212161655612 is an apocalyptic number.

It is an amenable number.

212161655612 is a deficient number, since it is larger than the sum of its proper divisors (159176928004).

212161655612 is a wasteful number, since it uses less digits than its factorization.

212161655612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7955188 (or 7955186 counting only the distinct ones).

The product of its digits is 43200, while the sum is 38.

The spelling of 212161655612 in words is "two hundred twelve billion, one hundred sixty-one million, six hundred fifty-five thousand, six hundred twelve".