21312059 has 2 divisors, whose sum is σ = 21312060. Its totient is φ = 21312058.

The previous prime is 21312023. The next prime is 21312077. The reversal of 21312059 is 95021312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21312059 - 2¹² = 21307963 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21312019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10656029 + 10656030.

It is an arithmetic number, because the mean of its divisors is an integer number (10656030).

Almost surely, 2^21312059 is an apocalyptic number.

21312059 is a deficient number, since it is larger than the sum of its proper divisors (1).

21312059 is an equidigital number, since it uses as much as digits as its factorization.

21312059 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 21312059 is about 4616.4985649299. The cubic root of 21312059 is about 277.2522865845.

The spelling of 21312059 in words is "twenty-one million, three hundred twelve thousand, fifty-nine".