2155432505212 has 12 divisors (see below), whose sum is σ = 4310865010480. Its totient is φ = 923756787936.

The previous prime is 2155432505209. The next prime is 2155432505251. The reversal of 2155432505212 is 2125052345512.

2155432505212 is an admirable number.

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, 38489866137 + ... + 38489866192.

Almost surely, 2^{2155432505212} is an apocalyptic number.

It is an amenable number.

2155432505212 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

2155432505212 is a wasteful number, since it uses less digits than its factorization.

2155432505212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76979732340 (or 76979732338 counting only the distinct ones).

The product of its (nonzero) digits is 120000, while the sum is 37.

The spelling of 2155432505212 in words is "two trillion, one hundred fifty-five billion, four hundred thirty-two million, five hundred five thousand, two hundred twelve".