2100120657 has 4 divisors (see below), whose sum is σ = 2800160880. Its totient is φ = 1400080436.

The previous prime is 2100120647. The next prime is 2100120661. The reversal of 2100120657 is 7560210012.

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 2100120657 - 2⁸ = 2100120401 is a prime.

It is a super-2 number, since 2×2100120657² = 8821013547916223298, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2100120647) 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, 350020107 + ... + 350020112.

It is an arithmetic number, because the mean of its divisors is an integer number (700040220).

Almost surely, 2^2100120657 is an apocalyptic number.

It is an amenable number.

2100120657 is a deficient number, since it is larger than the sum of its proper divisors (700040223).

2100120657 is an equidigital number, since it uses as much as digits as its factorization.

2100120657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700040222.

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 2100120657 is about 45827.0734064483. The cubic root of 2100120657 is about 1280.6036900480.

Adding to 2100120657 its reverse (7560210012), we get a palindrome (9660330669).

The spelling of 2100120657 in words is "two billion, one hundred million, one hundred twenty thousand, six hundred fifty-seven".