21425867 has 8 divisors (see below), whose sum is σ = 22880640. Its totient is φ = 20018880.

The previous prime is 21425851. The next prime is 21425881. The reversal of 21425867 is 76852412.

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 21425867 - 2⁴ = 21425851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21455867) 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, 11018 + ... + 12815.

It is an arithmetic number, because the mean of its divisors is an integer number (2860080).

Almost surely, 2^21425867 is an apocalyptic number.

21425867 is a deficient number, since it is larger than the sum of its proper divisors (1454773).

21425867 is a wasteful number, since it uses less digits than its factorization.

21425867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23893.

The product of its digits is 26880, while the sum is 35.

The square root of 21425867 is about 4628.8083779738. The cubic root of 21425867 is about 277.7449267403.

The spelling of 21425867 in words is "twenty-one million, four hundred twenty-five thousand, eight hundred sixty-seven".