21632667 has 16 divisors (see below), whose sum is σ = 33638400. Its totient is φ = 12360936.

The previous prime is 21632657. The next prime is 21632671. The reversal of 21632667 is 76623612.

It is not a de Polignac number, because 21632667 - 2⁴ = 21632651 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21632647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9483 + ... + 11540.

It is an arithmetic number, because the mean of its divisors is an integer number (2102400).

Almost surely, 2^21632667 is an apocalyptic number.

21632667 is a deficient number, since it is larger than the sum of its proper divisors (12005733).

21632667 is an equidigital number, since it uses as much as digits as its factorization.

21632667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21047 (or 21033 counting only the distinct ones).

The product of its digits is 18144, while the sum is 33.

The square root of 21632667 is about 4651.0930973267. The cubic root of 21632667 is about 278.6356544690.

The spelling of 21632667 in words is "twenty-one million, six hundred thirty-two thousand, six hundred sixty-seven".