21624059 has 2 divisors, whose sum is σ = 21624060. Its totient is φ = 21624058.

The previous prime is 21624041. The next prime is 21624061. The reversal of 21624059 is 95042612.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21624059 - 2⁸ = 21623803 is a prime.

Together with 21624061, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21624079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10812029 + 10812030.

It is an arithmetic number, because the mean of its divisors is an integer number (10812030).

Almost surely, 2^21624059 is an apocalyptic number.

21624059 is a deficient number, since it is larger than the sum of its proper divisors (1).

21624059 is an equidigital number, since it uses as much as digits as its factorization.

21624059 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 21624059 is about 4650.1676313871. The cubic root of 21624059 is about 278.5986916369.

The spelling of 21624059 in words is "twenty-one million, six hundred twenty-four thousand, fifty-nine".