2120561250557 has 4 divisors (see below), whose sum is σ = 2150428310496. Its totient is φ = 2090694190620.

The previous prime is 2120561250541. The next prime is 2120561250569. The reversal of 2120561250557 is 7550521650212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2120561250557 - 2⁴ = 2120561250541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120561253557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14933529863 + ... + 14933530004.

It is an arithmetic number, because the mean of its divisors is an integer number (537607077624).

Almost surely, 2^{2120561250557} is an apocalyptic number.

It is an amenable number.

2120561250557 is a deficient number, since it is larger than the sum of its proper divisors (29867059939).

2120561250557 is an equidigital number, since it uses as much as digits as its factorization.

2120561250557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29867059938.

The product of its (nonzero) digits is 210000, while the sum is 41.

The spelling of 2120561250557 in words is "two trillion, one hundred twenty billion, five hundred sixty-one million, two hundred fifty thousand, five hundred fifty-seven".