21634954 has 8 divisors (see below), whose sum is σ = 35402688. Its totient is φ = 9834060.

The previous prime is 21634919. The next prime is 21634961. The reversal of 21634954 is 45943612.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 491682 + ... + 491725.

It is an arithmetic number, because the mean of its divisors is an integer number (4425336).

Almost surely, 2^21634954 is an apocalyptic number.

21634954 is a deficient number, since it is larger than the sum of its proper divisors (13767734).

21634954 is a wasteful number, since it uses less digits than its factorization.

21634954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 983420.

The product of its digits is 25920, while the sum is 34.

The square root of 21634954 is about 4651.3389470130. The cubic root of 21634954 is about 278.6454732196.

It can be divided in two parts, 2163 and 4954, that added together give a palindrome (7117).

The spelling of 21634954 in words is "twenty-one million, six hundred thirty-four thousand, nine hundred fifty-four".