21650669 has 8 divisors (see below), whose sum is σ = 22320000. Its totient is φ = 20991600.

The previous prime is 21650653. The next prime is 21650683. The reversal of 21650669 is 96605612.

It is a happy number.

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 21650669 - 2⁴ = 21650653 is a prime.

It is a super-2 number, since 2×21650669² = 937502936295122, 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 (21650609) 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, 1832 + ... + 6830.

It is an arithmetic number, because the mean of its divisors is an integer number (2790000).

Almost surely, 2^21650669 is an apocalyptic number.

It is an amenable number.

21650669 is a deficient number, since it is larger than the sum of its proper divisors (669331).

21650669 is an equidigital number, since it uses as much as digits as its factorization.

21650669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5131.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 21650669 is about 4653.0279388802. The cubic root of 21650669 is about 278.7129235410.

The spelling of 21650669 in words is "twenty-one million, six hundred fifty thousand, six hundred sixty-nine".