2157388331 has 8 divisors (see below), whose sum is σ = 2480352000. Its totient is φ = 1838116008.

The previous prime is 2157388319. The next prime is 2157388361. The reversal of 2157388331 is 1338837512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2157388331 - 2¹⁰ = 2157387307 is a prime.

It is a super-2 number, since 2×2157388331² = 9308648821469931122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2157388361) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 921581 + ... + 923918.

It is an arithmetic number, because the mean of its divisors is an integer number (310044000).

Almost surely, 2^2157388331 is an apocalyptic number.

2157388331 is a deficient number, since it is larger than the sum of its proper divisors (322963669).

2157388331 is a wasteful number, since it uses less digits than its factorization.

2157388331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1845673.

The product of its digits is 120960, while the sum is 41.

The square root of 2157388331 is about 46447.6945714209. The cubic root of 2157388331 is about 1292.1396159114.

The spelling of 2157388331 in words is "two billion, one hundred fifty-seven million, three hundred eighty-eight thousand, three hundred thirty-one".