21464260 has 12 divisors (see below), whose sum is σ = 45074988. Its totient is φ = 8585696.

The previous prime is 21464249. The next prime is 21464269. The reversal of 21464260 is 6246412.

It can be written as a sum of positive squares in 2 ways, for example, as 7311616 + 14152644 = 2704^2 + 3762^2 .

It is not an unprimeable number, because it can be changed into a prime (21464269) 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, 536587 + ... + 536626.

It is an arithmetic number, because the mean of its divisors is an integer number (3756249).

Almost surely, 2^21464260 is an apocalyptic number.

21464260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21464260 is an abundant number, since it is smaller than the sum of its proper divisors (23610728).

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

21464260 is a wasteful number, since it uses less digits than its factorization.

21464260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1073222 (or 1073220 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 21464260 is about 4632.9537014738. The cubic root of 21464260 is about 277.9107247454.

The spelling of 21464260 in words is "twenty-one million, four hundred sixty-four thousand, two hundred sixty".