2120513057556 has 12 divisors (see below), whose sum is σ = 4947863800992. Its totient is φ = 706837685848.

The previous prime is 2120513057501. The next prime is 2120513057557. The reversal of 2120513057556 is 6557503150212.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120513057557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88354710720 + ... + 88354710743.

It is an arithmetic number, because the mean of its divisors is an integer number (412321983416).

Almost surely, 2^{2120513057556} is an apocalyptic number.

It is an amenable number.

2120513057556 is an abundant number, since it is smaller than the sum of its proper divisors (2827350743436).

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

2120513057556 is a wasteful number, since it uses less digits than its factorization.

2120513057556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176709421470 (or 176709421468 counting only the distinct ones).

The product of its (nonzero) digits is 315000, while the sum is 42.

The spelling of 2120513057556 in words is "two trillion, one hundred twenty billion, five hundred thirteen million, fifty-seven thousand, five hundred fifty-six".