21701459 has 6 divisors (see below), whose sum is σ = 23499396. Its totient is φ = 20031960.

The previous prime is 21701453. The next prime is 21701461. The reversal of 21701459 is 95410712.

It is not a de Polignac number, because 21701459 - 2²⁰ = 20652883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21701453) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 64037 + ... + 64374.

It is an arithmetic number, because the mean of its divisors is an integer number (3916566).

Almost surely, 2^21701459 is an apocalyptic number.

21701459 is a deficient number, since it is larger than the sum of its proper divisors (1797937).

21701459 is a wasteful number, since it uses less digits than its factorization.

21701459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128437 (or 128424 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 21701459 is about 4658.4824782326. The cubic root of 21701459 is about 278.9306962492.

The spelling of 21701459 in words is "twenty-one million, seven hundred one thousand, four hundred fifty-nine".