21613090943 has 2 divisors, whose sum is σ = 21613090944. Its totient is φ = 21613090942.

The previous prime is 21613090931. The next prime is 21613090969. The reversal of 21613090943 is 34909031612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21613090943 - 2⁸ = 21613090687 is a prime.

It is a super-2 number, since 2×21613090943² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21613090897 and 21613090906.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21613090243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10806545471 + 10806545472.

It is an arithmetic number, because the mean of its divisors is an integer number (10806545472).

Almost surely, 2^21613090943 is an apocalyptic number.

21613090943 is a deficient number, since it is larger than the sum of its proper divisors (1).

21613090943 is an equidigital number, since it uses as much as digits as its factorization.

21613090943 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 38.

The spelling of 21613090943 in words is "twenty-one billion, six hundred thirteen million, ninety thousand, nine hundred forty-three".