21303940 has 48 divisors (see below), whose sum is σ = 53827200. Its totient is φ = 6918912.

The previous prime is 21303917. The next prime is 21303943. The reversal of 21303940 is 4930312.

It is not an unprimeable number, because it can be changed into a prime (21303943) 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, 1345 + ... + 6664.

It is an arithmetic number, because the mean of its divisors is an integer number (1121400).

Almost surely, 2^21303940 is an apocalyptic number.

21303940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21303940 is an abundant number, since it is smaller than the sum of its proper divisors (32523260).

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

21303940 is a wasteful number, since it uses less digits than its factorization.

21303940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8044 (or 8042 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 21303940 is about 4615.6191350674. The cubic root of 21303940 is about 277.2170749511.

The spelling of 21303940 in words is "twenty-one million, three hundred three thousand, nine hundred forty".