21346280 has 32 divisors (see below), whose sum is σ = 48940200. Its totient is φ = 8376576.

The previous prime is 21346261. The next prime is 21346289. The reversal of 21346280 is 8264312.

It can be written as a sum of positive squares in 4 ways, for example, as 16826404 + 4519876 = 4102^2 + 2126^2 .

It is not an unprimeable number, because it can be changed into a prime (21346289) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2915 + ... + 7154.

Almost surely, 2^21346280 is an apocalyptic number.

21346280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21346280 is an abundant number, since it is smaller than the sum of its proper divisors (27593920).

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

21346280 is a wasteful number, since it uses less digits than its factorization.

21346280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10133 (or 10129 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 21346280 is about 4620.2034587234. The cubic root of 21346280 is about 277.4006028777.

The spelling of 21346280 in words is "twenty-one million, three hundred forty-six thousand, two hundred eighty".