2157971008321 has 8 divisors (see below), whose sum is σ = 2162050833600. Its totient is φ = 2153892556848.

The previous prime is 2157971008313. The next prime is 2157971008357. The reversal of 2157971008321 is 1238001797512.

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 2157971008321 - 2³ = 2157971008313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2157971008621) 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, 2828755 + ... + 3509671.

It is an arithmetic number, because the mean of its divisors is an integer number (270256354200).

Almost surely, 2^{2157971008321} is an apocalyptic number.

It is an amenable number.

2157971008321 is a deficient number, since it is larger than the sum of its proper divisors (4079825279).

2157971008321 is an equidigital number, since it uses as much as digits as its factorization.

2157971008321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 686903.

The product of its (nonzero) digits is 211680, while the sum is 46.

The spelling of 2157971008321 in words is "two trillion, one hundred fifty-seven billion, nine hundred seventy-one million, eight thousand, three hundred twenty-one".