21634229 has 8 divisors (see below), whose sum is σ = 22325760. Its totient is φ = 20953296.

The previous prime is 21634213. The next prime is 21634253. The reversal of 21634229 is 92243612.

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

It is a cyclic number.

It is not a de Polignac number, because 21634229 - 2⁴ = 21634213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21634259) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1604 + ... + 6770.

It is an arithmetic number, because the mean of its divisors is an integer number (2790720).

Almost surely, 2^21634229 is an apocalyptic number.

It is an amenable number.

21634229 is a deficient number, since it is larger than the sum of its proper divisors (691531).

21634229 is an equidigital number, since it uses as much as digits as its factorization.

21634229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5299.

The product of its digits is 5184, while the sum is 29.

The square root of 21634229 is about 4651.2610118117. The cubic root of 21634229 is about 278.6423606604.

The spelling of 21634229 in words is "twenty-one million, six hundred thirty-four thousand, two hundred twenty-nine".