21696467 has 16 divisors (see below), whose sum is σ = 24578400. Its totient is φ = 19014912.

The previous prime is 21696457. The next prime is 21696487. The reversal of 21696467 is 76469612.

It is a cyclic number.

It is not a de Polignac number, because 21696467 - 2⁸ = 21696211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21696427) 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, 20159 + ... + 21207.

It is an arithmetic number, because the mean of its divisors is an integer number (1536150).

Almost surely, 2^21696467 is an apocalyptic number.

21696467 is a deficient number, since it is larger than the sum of its proper divisors (2881933).

21696467 is a wasteful number, since it uses less digits than its factorization.

21696467 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1142.

The product of its digits is 108864, while the sum is 41.

The square root of 21696467 is about 4657.9466506176. The cubic root of 21696467 is about 278.9093070757.

The spelling of 21696467 in words is "twenty-one million, six hundred ninety-six thousand, four hundred sixty-seven".