21762679 has 2 divisors, whose sum is σ = 21762680. Its totient is φ = 21762678.

The previous prime is 21762661. The next prime is 21762721. The reversal of 21762679 is 97626712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21762679 - 2⁵ = 21762647 is a prime.

It is a super-2 number, since 2×21762679² = 947228394514082, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21762649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10881339 + 10881340.

It is an arithmetic number, because the mean of its divisors is an integer number (10881340).

Almost surely, 2^21762679 is an apocalyptic number.

21762679 is a deficient number, since it is larger than the sum of its proper divisors (1).

21762679 is an equidigital number, since it uses as much as digits as its factorization.

21762679 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63504, while the sum is 40.

The square root of 21762679 is about 4665.0486599820. The cubic root of 21762679 is about 279.1927386160.

The spelling of 21762679 in words is "twenty-one million, seven hundred sixty-two thousand, six hundred seventy-nine".