21667276 has 12 divisors (see below), whose sum is σ = 38437672. Its totient is φ = 10685088.

The previous prime is 21667273. The next prime is 21667279. The reversal of 21667276 is 67276612.

It is an interprime number because it is at equal distance from previous prime (21667273) and next prime (21667279).

It is not an unprimeable number, because it can be changed into a prime (21667271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36810 + ... + 37393.

Almost surely, 2^21667276 is an apocalyptic number.

It is an amenable number.

21667276 is a deficient number, since it is larger than the sum of its proper divisors (16770396).

21667276 is a wasteful number, since it uses less digits than its factorization.

21667276 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74280 (or 74278 counting only the distinct ones).

The product of its digits is 42336, while the sum is 37.

The square root of 21667276 is about 4654.8121336956. The cubic root of 21667276 is about 278.7841669528.

The spelling of 21667276 in words is "twenty-one million, six hundred sixty-seven thousand, two hundred seventy-six".