21907669 has 8 divisors (see below), whose sum is σ = 25845248. Its totient is φ = 18172080.

The previous prime is 21907643. The next prime is 21907693. The reversal of 21907669 is 96670912.

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 21907669 - 2⁷ = 21907541 is a prime.

It is a super-2 number, since 2×21907669² = 959891922027122, 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 (21907469) 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, 50262 + ... + 50695.

It is an arithmetic number, because the mean of its divisors is an integer number (3230656).

Almost surely, 2^21907669 is an apocalyptic number.

It is an amenable number.

21907669 is a deficient number, since it is larger than the sum of its proper divisors (3937579).

21907669 is a wasteful number, since it uses less digits than its factorization.

21907669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100995.

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 21907669 is about 4680.5628934990. The cubic root of 21907669 is about 279.8113908378.

The spelling of 21907669 in words is "twenty-one million, nine hundred seven thousand, six hundred sixty-nine".