21465683 has 2 divisors, whose sum is σ = 21465684. Its totient is φ = 21465682.

The previous prime is 21465659. The next prime is 21465701. The reversal of 21465683 is 38656412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21465683 - 2²⁰ = 20417107 is a prime.

It is not a weakly prime, because it can be changed into another prime (21465623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10732841 + 10732842.

It is an arithmetic number, because the mean of its divisors is an integer number (10732842).

Almost surely, 2^21465683 is an apocalyptic number.

21465683 is the 2477-th centered heptagonal number.

21465683 is a deficient number, since it is larger than the sum of its proper divisors (1).

21465683 is an equidigital number, since it uses as much as digits as its factorization.

21465683 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 35.

The square root of 21465683 is about 4633.1072726627. The cubic root of 21465683 is about 277.9168660896.

The spelling of 21465683 in words is "twenty-one million, four hundred sixty-five thousand, six hundred eighty-three".