2156672173281 has 4 divisors (see below), whose sum is σ = 2875562897712. Its totient is φ = 1437781448852.

The previous prime is 2156672173259. The next prime is 2156672173309. The reversal of 2156672173281 is 1823712766512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2156672173281 - 2¹⁰ = 2156672172257 is a prime.

It is a super-2 number, since 2×2156672173281² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2156672173081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 359445362211 + ... + 359445362216.

It is an arithmetic number, because the mean of its divisors is an integer number (718890724428).

Almost surely, 2^{2156672173281} is an apocalyptic number.

It is an amenable number.

2156672173281 is a deficient number, since it is larger than the sum of its proper divisors (718890724431).

2156672173281 is an equidigital number, since it uses as much as digits as its factorization.

2156672173281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718890724430.

The product of its digits is 1693440, while the sum is 51.

The spelling of 2156672173281 in words is "two trillion, one hundred fifty-six billion, six hundred seventy-two million, one hundred seventy-three thousand, two hundred eighty-one".