21120656654623 has 8 divisors (see below), whose sum is σ = 22363139978928. Its totient is φ = 19878183525504.

The previous prime is 21120656654611. The next prime is 21120656654663. The reversal of 21120656654623 is 32645665602112.

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 21120656654623 - 2¹³ = 21120656646431 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 (21120656654663) 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, 1942465 + ... + 6783397.

It is an arithmetic number, because the mean of its divisors is an integer number (2795392497366).

Almost surely, 2^{21120656654623} is an apocalyptic number.

21120656654623 is a deficient number, since it is larger than the sum of its proper divisors (1242483324305).

21120656654623 is a wasteful number, since it uses less digits than its factorization.

21120656654623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5097593.

The product of its (nonzero) digits is 3110400, while the sum is 49.

The spelling of 21120656654623 in words is "twenty-one trillion, one hundred twenty billion, six hundred fifty-six million, six hundred fifty-four thousand, six hundred twenty-three".