21692113 has 2 divisors, whose sum is σ = 21692114. Its totient is φ = 21692112.

The previous prime is 21692107. The next prime is 21692137. The reversal of 21692113 is 31129612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21603904 + 88209 = 4648^2 + 297^2 .

It is a cyclic number.

It is not a de Polignac number, because 21692113 - 2¹⁷ = 21561041 is a prime.

It is not a weakly prime, because it can be changed into another prime (21692183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10846056 + 10846057.

It is an arithmetic number, because the mean of its divisors is an integer number (10846057).

Almost surely, 2^21692113 is an apocalyptic number.

It is an amenable number.

21692113 is a deficient number, since it is larger than the sum of its proper divisors (1).

21692113 is an equidigital number, since it uses as much as digits as its factorization.

21692113 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648, while the sum is 25.

The square root of 21692113 is about 4657.4792538454. The cubic root of 21692113 is about 278.8906488557.

It can be divided in two parts, 216 and 92113, that added together give a palindrome (92329).

The spelling of 21692113 in words is "twenty-one million, six hundred ninety-two thousand, one hundred thirteen".