21195059 has 2 divisors, whose sum is σ = 21195060. Its totient is φ = 21195058.

The previous prime is 21195049. The next prime is 21195061. The reversal of 21195059 is 95059112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21195059 - 2¹² = 21190963 is a prime.

It is a Sophie Germain prime.

Together with 21195061, 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 (21195019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10597529 + 10597530.

It is an arithmetic number, because the mean of its divisors is an integer number (10597530).

Almost surely, 2^21195059 is an apocalyptic number.

21195059 is a deficient number, since it is larger than the sum of its proper divisors (1).

21195059 is an equidigital number, since it uses as much as digits as its factorization.

21195059 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4050, while the sum is 32.

The square root of 21195059 is about 4603.8091837086. The cubic root of 21195059 is about 276.7439975120.

The spelling of 21195059 in words is "twenty-one million, one hundred ninety-five thousand, fifty-nine".