21467965 has 16 divisors (see below), whose sum is σ = 27219456. Its totient is φ = 16228800.

The previous prime is 21467959. The next prime is 21467977. The reversal of 21467965 is 56976412.

It is not a de Polignac number, because 21467965 - 2⁵ = 21467933 is a prime.

It is a Duffinian number.

It is a zygodrome in base 11.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5055 + ... + 8275.

It is an arithmetic number, because the mean of its divisors is an integer number (1701216).

Almost surely, 2^21467965 is an apocalyptic number.

It is an amenable number.

21467965 is a deficient number, since it is larger than the sum of its proper divisors (5751491).

21467965 is a wasteful number, since it uses less digits than its factorization.

21467965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3300.

The product of its digits is 90720, while the sum is 40.

The square root of 21467965 is about 4633.3535371262. The cubic root of 21467965 is about 277.9267141156.

The spelling of 21467965 in words is "twenty-one million, four hundred sixty-seven thousand, nine hundred sixty-five".