2156321643915 has 16 divisors (see below), whose sum is σ = 3453868857600. Its totient is φ = 1148786800992.

The previous prime is 2156321643893. The next prime is 2156321643923. The reversal of 2156321643915 is 5193461236512.

It is not a de Polignac number, because 2156321643915 - 2¹⁸ = 2156321381771 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78198825 + ... + 78226394.

It is an arithmetic number, because the mean of its divisors is an integer number (215866803600).

Almost surely, 2^{2156321643915} is an apocalyptic number.

2156321643915 is a deficient number, since it is larger than the sum of its proper divisors (1297547213685).

2156321643915 is a wasteful number, since it uses less digits than its factorization.

2156321643915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156426146.

The product of its digits is 1166400, while the sum is 48.

The spelling of 2156321643915 in words is "two trillion, one hundred fifty-six billion, three hundred twenty-one million, six hundred forty-three thousand, nine hundred fifteen".