21692263 has 2 divisors, whose sum is σ = 21692264. Its totient is φ = 21692262.

The previous prime is 21692213. The next prime is 21692267. The reversal of 21692263 is 36229612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21692263 - 2⁹ = 21691751 is a prime.

It is a super-2 number, since 2×21692263² = 941108548122338, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21692267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10846131 + 10846132.

It is an arithmetic number, because the mean of its divisors is an integer number (10846132).

Almost surely, 2^21692263 is an apocalyptic number.

21692263 is a deficient number, since it is larger than the sum of its proper divisors (1).

21692263 is an equidigital number, since it uses as much as digits as its factorization.

21692263 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 31.

The square root of 21692263 is about 4657.4953569488. The cubic root of 21692263 is about 278.8912916931.

The spelling of 21692263 in words is "twenty-one million, six hundred ninety-two thousand, two hundred sixty-three".