21624069 has 8 divisors (see below), whose sum is σ = 29009632. Its totient is φ = 14327280.

The previous prime is 21624067. The next prime is 21624077. The reversal of 21624069 is 96042612.

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

It is not a de Polignac number, because 21624069 - 2¹ = 21624067 is a prime.

It is a super-2 number, since 2×21624069² = 935200720233522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21624061) 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, 21622 + ... + 22599.

It is an arithmetic number, because the mean of its divisors is an integer number (3626204).

Almost surely, 2^21624069 is an apocalyptic number.

It is an amenable number.

21624069 is a deficient number, since it is larger than the sum of its proper divisors (7385563).

21624069 is a wasteful number, since it uses less digits than its factorization.

21624069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44387.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 21624069 is about 4650.1687066170. The cubic root of 21624069 is about 278.5987345827.

The spelling of 21624069 in words is "twenty-one million, six hundred twenty-four thousand, sixty-nine".