21867465 has 16 divisors (see below), whose sum is σ = 35582400. Its totient is φ = 11464512.

The previous prime is 21867451. The next prime is 21867467. The reversal of 21867465 is 56476812.

It is not a de Polignac number, because 21867465 - 2⁴ = 21867449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21867467) 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, 11470 + ... + 13239.

It is an arithmetic number, because the mean of its divisors is an integer number (2223900).

Almost surely, 2^21867465 is an apocalyptic number.

It is an amenable number.

21867465 is a deficient number, since it is larger than the sum of its proper divisors (13714935).

21867465 is a wasteful number, since it uses less digits than its factorization.

21867465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24776.

The product of its digits is 80640, while the sum is 39.

The square root of 21867465 is about 4676.2661387051. The cubic root of 21867465 is about 279.6401201329.

The spelling of 21867465 in words is "twenty-one million, eight hundred sixty-seven thousand, four hundred sixty-five".