21860967 has 4 divisors (see below), whose sum is σ = 29147960. Its totient is φ = 14573976.

The previous prime is 21860941. The next prime is 21860977. The reversal of 21860967 is 76906812.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21860967 - 2⁸ = 21860711 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21860977) 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, 3643492 + ... + 3643497.

It is an arithmetic number, because the mean of its divisors is an integer number (7286990).

Almost surely, 2^21860967 is an apocalyptic number.

21860967 is a deficient number, since it is larger than the sum of its proper divisors (7286993).

21860967 is an equidigital number, since it uses as much as digits as its factorization.

21860967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7286992.

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 21860967 is about 4675.5713019908. The cubic root of 21860967 is about 279.6124186821.

The spelling of 21860967 in words is "twenty-one million, eight hundred sixty thousand, nine hundred sixty-seven".