21613699 has 2 divisors, whose sum is σ = 21613700. Its totient is φ = 21613698.

The previous prime is 21613693. The next prime is 21613741. The reversal of 21613699 is 99631612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21613699 - 2¹⁵ = 21580931 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21613693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10806849 + 10806850.

It is an arithmetic number, because the mean of its divisors is an integer number (10806850).

Almost surely, 2^21613699 is an apocalyptic number.

21613699 is a deficient number, since it is larger than the sum of its proper divisors (1).

21613699 is an equidigital number, since it uses as much as digits as its factorization.

21613699 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17496, while the sum is 37.

The square root of 21613699 is about 4649.0535595968. The cubic root of 21613699 is about 278.5541926908.

The spelling of 21613699 in words is "twenty-one million, six hundred thirteen thousand, six hundred ninety-nine".