2157209327 has 16 divisors (see below), whose sum is σ = 2794767360. Its totient is φ = 1616969952.

The previous prime is 2157209293. The next prime is 2157209333. The reversal of 2157209327 is 7239027512.

It is a happy number.

It is not a de Polignac number, because 2157209327 - 2⁸ = 2157209071 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157209347) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 622103 + ... + 625560.

It is an arithmetic number, because the mean of its divisors is an integer number (174672960).

Almost surely, 2^2157209327 is an apocalyptic number.

2157209327 is a deficient number, since it is larger than the sum of its proper divisors (637558033).

2157209327 is a wasteful number, since it uses less digits than its factorization.

2157209327 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1247702.

The product of its (nonzero) digits is 52920, while the sum is 38.

The square root of 2157209327 is about 46445.7675897385. The cubic root of 2157209327 is about 1292.1038775522.

The spelling of 2157209327 in words is "two billion, one hundred fifty-seven million, two hundred nine thousand, three hundred twenty-seven".