22613444431621 has 2 divisors, whose sum is σ = 22613444431622. Its totient is φ = 22613444431620.

The previous prime is 22613444431609. The next prime is 22613444431639. The reversal of 22613444431621 is 12613444431622.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21890102686596 + 723341745025 = 4678686^2 + 850495^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22613444431621 is a prime.

It is a super-2 number, since 2×22613444431621² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22613444401621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11306722215810 + 11306722215811.

It is an arithmetic number, because the mean of its divisors is an integer number (11306722215811).

Almost surely, 2^{22613444431621} is an apocalyptic number.

It is an amenable number.

22613444431621 is a deficient number, since it is larger than the sum of its proper divisors (1).

22613444431621 is an equidigital number, since it uses as much as digits as its factorization.

22613444431621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 663552, while the sum is 43.

Subtracting from 22613444431621 its reverse (12613444431622), we obtain a palindrome (9999999999999).

The spelling of 22613444431621 in words is "twenty-two trillion, six hundred thirteen billion, four hundred forty-four million, four hundred thirty-one thousand, six hundred twenty-one".