21629465 has 32 divisors (see below), whose sum is σ = 30844800. Its totient is φ = 14439360.

The previous prime is 21629437. The next prime is 21629471. The reversal of 21629465 is 56492612.

It is a happy number.

It is not a de Polignac number, because 21629465 - 2⁶ = 21629401 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 120746 + ... + 120924.

It is an arithmetic number, because the mean of its divisors is an integer number (963900).

Almost surely, 2^21629465 is an apocalyptic number.

It is an amenable number.

21629465 is a deficient number, since it is larger than the sum of its proper divisors (9215335).

21629465 is a wasteful number, since it uses less digits than its factorization.

21629465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234 (or 208 counting only the distinct ones).

The product of its digits is 25920, while the sum is 35.

The square root of 21629465 is about 4650.7488644303. The cubic root of 21629465 is about 278.6219061967.

The spelling of 21629465 in words is "twenty-one million, six hundred twenty-nine thousand, four hundred sixty-five".