21456059 has 2 divisors, whose sum is σ = 21456060. Its totient is φ = 21456058.

The previous prime is 21456053. The next prime is 21456067. The reversal of 21456059 is 95065412.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21456059 - 2²⁰ = 20407483 is a prime.

It is a super-2 number, since 2×21456059² = 920724935622962, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21456053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10728029 + 10728030.

It is an arithmetic number, because the mean of its divisors is an integer number (10728030).

Almost surely, 2^21456059 is an apocalyptic number.

21456059 is a deficient number, since it is larger than the sum of its proper divisors (1).

21456059 is an equidigital number, since it uses as much as digits as its factorization.

21456059 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 21456059 is about 4632.0685443978. The cubic root of 21456059 is about 277.8753258050.

The spelling of 21456059 in words is "twenty-one million, four hundred fifty-six thousand, fifty-nine".