21162679 has 2 divisors, whose sum is σ = 21162680. Its totient is φ = 21162678.

The previous prime is 21162653. The next prime is 21162697. The reversal of 21162679 is 97626112.

Together with next prime (21162697) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21162679 - 2⁷ = 21162551 is a prime.

It is equal to p_1339567 and since 21162679 and 1339567 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21160679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10581339 + 10581340.

It is an arithmetic number, because the mean of its divisors is an integer number (10581340).

Almost surely, 2^21162679 is an apocalyptic number.

21162679 is a deficient number, since it is larger than the sum of its proper divisors (1).

21162679 is an equidigital number, since it uses as much as digits as its factorization.

21162679 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 34.

The square root of 21162679 is about 4600.2911864359. The cubic root of 21162679 is about 276.6029970744.

The spelling of 21162679 in words is "twenty-one million, one hundred sixty-two thousand, six hundred seventy-nine".