21464459 has 2 divisors, whose sum is σ = 21464460. Its totient is φ = 21464458.

The previous prime is 21464449. The next prime is 21464467. The reversal of 21464459 is 95446412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21464459 - 2⁸ = 21464203 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21464449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10732229 + 10732230.

It is an arithmetic number, because the mean of its divisors is an integer number (10732230).

Almost surely, 2^21464459 is an apocalyptic number.

21464459 is a deficient number, since it is larger than the sum of its proper divisors (1).

21464459 is an equidigital number, since it uses as much as digits as its factorization.

21464459 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 21464459 is about 4632.9751780039. The cubic root of 21464459 is about 277.9115836004.

The spelling of 21464459 in words is "twenty-one million, four hundred sixty-four thousand, four hundred fifty-nine".