2111556020720 has 40 divisors (see below), whose sum is σ = 4948024210944. Its totient is φ = 837971834112.

The previous prime is 2111556020689. The next prime is 2111556020737. The reversal of 2111556020720 is 270206551112.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 103904999 + ... + 103925318.

Almost surely, 2^{2111556020720} is an apocalyptic number.

2111556020720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2111556020720 is an abundant number, since it is smaller than the sum of its proper divisors (2836468190224).

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

2111556020720 is a wasteful number, since it uses less digits than its factorization.

2111556020720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207830457 (or 207830451 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 32.

The spelling of 2111556020720 in words is "two trillion, one hundred eleven billion, five hundred fifty-six million, twenty thousand, seven hundred twenty".