21347264 has 28 divisors (see below), whose sum is σ = 43351704. Its totient is φ = 10424064.

The previous prime is 21347239. The next prime is 21347267. The reversal of 21347264 is 46274312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21347267) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1127 + ... + 6630.

Almost surely, 2^21347264 is an apocalyptic number.

It is an amenable number.

21347264 is an abundant number, since it is smaller than the sum of its proper divisors (22004440).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21347264 is an equidigital number, since it uses as much as digits as its factorization.

21347264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7812 (or 7802 counting only the distinct ones).

The product of its digits is 8064, while the sum is 29.

The square root of 21347264 is about 4620.3099463131. The cubic root of 21347264 is about 277.4048652597.

The spelling of 21347264 in words is "twenty-one million, three hundred forty-seven thousand, two hundred sixty-four".