21634059 has 4 divisors (see below), whose sum is σ = 28845416. Its totient is φ = 14422704.

The previous prime is 21634051. The next prime is 21634073. The reversal of 21634059 is 95043612.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21634059 - 2³ = 21634051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21634051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3605674 + ... + 3605679.

It is an arithmetic number, because the mean of its divisors is an integer number (7211354).

Almost surely, 2^21634059 is an apocalyptic number.

21634059 is a deficient number, since it is larger than the sum of its proper divisors (7211357).

21634059 is an equidigital number, since it uses as much as digits as its factorization.

21634059 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7211356.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 21634059 is about 4651.2427371618. The cubic root of 21634059 is about 278.6416308089.

The spelling of 21634059 in words is "twenty-one million, six hundred thirty-four thousand, fifty-nine".