21337580 has 24 divisors (see below), whose sum is σ = 48882960. Its totient is φ = 7759040.

The previous prime is 21337571. The next prime is 21337607. The reversal of 21337580 is 8573312.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48275 + ... + 48714.

It is an arithmetic number, because the mean of its divisors is an integer number (2036790).

Almost surely, 2^21337580 is an apocalyptic number.

21337580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21337580 is an abundant number, since it is smaller than the sum of its proper divisors (27545380).

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

21337580 is a wasteful number, since it uses less digits than its factorization.

21337580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97009 (or 97007 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 21337580 is about 4619.2618457931. The cubic root of 21337580 is about 277.3629114831.

The spelling of 21337580 in words is "twenty-one million, three hundred thirty-seven thousand, five hundred eighty".