2121509137072 has 20 divisors (see below), whose sum is σ = 4426610411440. Its totient is φ = 979158063168.

The previous prime is 2121509137043. The next prime is 2121509137133. The reversal of 2121509137072 is 2707319051212.

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, 5099781372 + ... + 5099781787.

It is an arithmetic number, because the mean of its divisors is an integer number (221330520572).

Almost surely, 2^{2121509137072} is an apocalyptic number.

It is an amenable number.

2121509137072 is an abundant number, since it is smaller than the sum of its proper divisors (2305101274368).

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

2121509137072 is a wasteful number, since it uses less digits than its factorization.

2121509137072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10199563180 (or 10199563174 counting only the distinct ones).

The product of its (nonzero) digits is 52920, while the sum is 40.

The spelling of 2121509137072 in words is "two trillion, one hundred twenty-one billion, five hundred nine million, one hundred thirty-seven thousand, seventy-two".