2156793339421 has 16 divisors (see below), whose sum is σ = 2544527600640. Its totient is φ = 1788969363840.

The previous prime is 2156793339409. The next prime is 2156793339427. The reversal of 2156793339421 is 1249333976512.

It is a cyclic number.

It is not a de Polignac number, because 2156793339421 - 2²¹ = 2156791242269 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 (2156793339427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5248035 + ... + 5644063.

It is an arithmetic number, because the mean of its divisors is an integer number (159032975040).

Almost surely, 2^{2156793339421} is an apocalyptic number.

It is an amenable number.

2156793339421 is a deficient number, since it is larger than the sum of its proper divisors (387734261219).

2156793339421 is a wasteful number, since it uses less digits than its factorization.

2156793339421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421164.

The product of its digits is 7348320, while the sum is 55.

The spelling of 2156793339421 in words is "two trillion, one hundred fifty-six billion, seven hundred ninety-three million, three hundred thirty-nine thousand, four hundred twenty-one".