21295459 has 2 divisors, whose sum is σ = 21295460. Its totient is φ = 21295458.

The previous prime is 21295411. The next prime is 21295489. The reversal of 21295459 is 95459212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21295459 is a prime.

It is not a weakly prime, because it can be changed into another prime (21295489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10647729 + 10647730.

It is an arithmetic number, because the mean of its divisors is an integer number (10647730).

Almost surely, 2^21295459 is an apocalyptic number.

21295459 is a deficient number, since it is larger than the sum of its proper divisors (1).

21295459 is an equidigital number, since it uses as much as digits as its factorization.

21295459 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32400, while the sum is 37.

The square root of 21295459 is about 4614.7003152968. The cubic root of 21295459 is about 277.1802837900.

The spelling of 21295459 in words is "twenty-one million, two hundred ninety-five thousand, four hundred fifty-nine".