101561857212 has 12 divisors (see below), whose sum is σ = 236977666856. Its totient is φ = 33853952400.

The previous prime is 101561857193. The next prime is 101561857237. The reversal of 101561857212 is 212758165101.

It is a tau number, because it is divible by the number of its divisors (12).

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, 4231744039 + ... + 4231744062.

Almost surely, 2^101561857212 is an apocalyptic number.

101561857212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

101561857212 is an abundant number, since it is smaller than the sum of its proper divisors (135415809644).

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

101561857212 is a wasteful number, since it uses less digits than its factorization.

101561857212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8463488108 (or 8463488106 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 39.

The spelling of 101561857212 in words is "one hundred one billion, five hundred sixty-one million, eight hundred fifty-seven thousand, two hundred twelve".