2157012701 has 4 divisors (see below), whose sum is σ = 2157111132. Its totient is φ = 2156914272.

The previous prime is 2157012667. The next prime is 2157012707. The reversal of 2157012701 is 1072107512.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 498405625 + 1658607076 = 22325^2 + 40726^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2157012701 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 (2157012707) 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, 185 + ... + 65681.

It is an arithmetic number, because the mean of its divisors is an integer number (539277783).

Almost surely, 2^2157012701 is an apocalyptic number.

It is an amenable number.

2157012701 is a deficient number, since it is larger than the sum of its proper divisors (98431).

2157012701 is an equidigital number, since it uses as much as digits as its factorization.

2157012701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98430.

The product of its (nonzero) digits is 980, while the sum is 26.

The square root of 2157012701 is about 46443.6508147239. The cubic root of 2157012701 is about 1292.0646186613.

The spelling of 2157012701 in words is "two billion, one hundred fifty-seven million, twelve thousand, seven hundred one".