2156221651583 has 8 divisors (see below), whose sum is σ = 2159299437120. Its totient is φ = 2153144086560.

The previous prime is 2156221651579. The next prime is 2156221651589. The reversal of 2156221651583 is 3851561226512.

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 2156221651583 - 2² = 2156221651579 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156221651589) 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, 38738513 + ... + 38794133.

It is an arithmetic number, because the mean of its divisors is an integer number (269912429640).

Almost surely, 2^{2156221651583} is an apocalyptic number.

2156221651583 is a deficient number, since it is larger than the sum of its proper divisors (3077785537).

2156221651583 is an equidigital number, since it uses as much as digits as its factorization.

2156221651583 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110257.

The product of its digits is 864000, while the sum is 47.

The spelling of 2156221651583 in words is "two trillion, one hundred fifty-six billion, two hundred twenty-one million, six hundred fifty-one thousand, five hundred eighty-three".