2157061120720 has 40 divisors (see below), whose sum is σ = 5471091390240. Its totient is φ = 784385861760.

The previous prime is 2157061120663. The next prime is 2157061120871. The reversal of 2157061120720 is 270211607512.

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 polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1225602030 + ... + 1225603789.

It is an arithmetic number, because the mean of its divisors is an integer number (136777284756).

Almost surely, 2^{2157061120720} is an apocalyptic number.

2157061120720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2157061120720 is an abundant number, since it is smaller than the sum of its proper divisors (3314030269520).

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

2157061120720 is a wasteful number, since it uses less digits than its factorization.

2157061120720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2451205843 (or 2451205837 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 34.

The spelling of 2157061120720 in words is "two trillion, one hundred fifty-seven billion, sixty-one million, one hundred twenty thousand, seven hundred twenty".