2157493305 has 32 divisors (see below), whose sum is σ = 3771596160. Its totient is φ = 1044449280.

The previous prime is 2157493279. The next prime is 2157493321. The reversal of 2157493305 is 5033947512.

It is a happy number.

It is not a de Polignac number, because 2157493305 - 2⁸ = 2157493049 is a prime.

It is a super-2 number, since 2×2157493305² = 9309554722239646050, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 101331 + ... + 120759.

It is an arithmetic number, because the mean of its divisors is an integer number (117862380).

Almost surely, 2^2157493305 is an apocalyptic number.

It is an amenable number.

2157493305 is a deficient number, since it is larger than the sum of its proper divisors (1614102855).

2157493305 is a wasteful number, since it uses less digits than its factorization.

2157493305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20121.

The product of its (nonzero) digits is 113400, while the sum is 39.

The square root of 2157493305 is about 46448.8245814682. The cubic root of 2157493305 is about 1292.1605731744.

The spelling of 2157493305 in words is "two billion, one hundred fifty-seven million, four hundred ninety-three thousand, three hundred five".