2157212615 has 8 divisors (see below), whose sum is σ = 2588909280. Its totient is φ = 1725600672.

The previous prime is 2157212609. The next prime is 2157212639. The reversal of 2157212615 is 5162127512.

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 2157212615 - 2⁸ = 2157212359 is a prime.

It is a super-3 number, since 3×2157212615³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72581 + ... + 97889.

It is an arithmetic number, because the mean of its divisors is an integer number (323613660).

Almost surely, 2^2157212615 is an apocalyptic number.

2157212615 is a deficient number, since it is larger than the sum of its proper divisors (431696665).

2157212615 is a wasteful number, since it uses less digits than its factorization.

2157212615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42361.

The product of its digits is 8400, while the sum is 32.

The square root of 2157212615 is about 46445.8029858458. The cubic root of 2157212615 is about 1292.1045340231.

The spelling of 2157212615 in words is "two billion, one hundred fifty-seven million, two hundred twelve thousand, six hundred fifteen".