21101459 has 2 divisors, whose sum is σ = 21101460. Its totient is φ = 21101458.

The previous prime is 21101441. The next prime is 21101461. The reversal of 21101459 is 95410112.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21101459 is a prime.

Together with 21101461, 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 (21191459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550729 + 10550730.

It is an arithmetic number, because the mean of its divisors is an integer number (10550730).

Almost surely, 2^21101459 is an apocalyptic number.

21101459 is a deficient number, since it is larger than the sum of its proper divisors (1).

21101459 is an equidigital number, since it uses as much as digits as its factorization.

21101459 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 21101459 is about 4593.6324406726. The cubic root of 21101459 is about 276.3360177933.

The spelling of 21101459 in words is "twenty-one million, one hundred one thousand, four hundred fifty-nine".