21613100633 has 2 divisors, whose sum is σ = 21613100634. Its totient is φ = 21613100632.

The previous prime is 21613100627. The next prime is 21613100651. The reversal of 21613100633 is 33600131612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11490124864 + 10122975769 = 107192^2 + 100613^2 .

It is a cyclic number.

It is not a de Polignac number, because 21613100633 - 2²⁴ = 21596323417 is a prime.

It is a super-2 number, since 2×21613100633² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (21613100693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10806550316 + 10806550317.

It is an arithmetic number, because the mean of its divisors is an integer number (10806550317).

Almost surely, 2^21613100633 is an apocalyptic number.

It is an amenable number.

21613100633 is a deficient number, since it is larger than the sum of its proper divisors (1).

21613100633 is an equidigital number, since it uses as much as digits as its factorization.

21613100633 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 26.

The spelling of 21613100633 in words is "twenty-one billion, six hundred thirteen million, one hundred thousand, six hundred thirty-three".