21337420 has 24 divisors (see below), whose sum is σ = 48255984. Its totient is φ = 7878336.

The previous prime is 21337369. The next prime is 21337439. The reversal of 21337420 is 2473312.

It is a junction number, because it is equal to n+sod(n) for n = 21337391 and 21337400.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40774 + ... + 41293.

It is an arithmetic number, because the mean of its divisors is an integer number (2010666).

Almost surely, 2^21337420 is an apocalyptic number.

21337420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21337420 is an abundant number, since it is smaller than the sum of its proper divisors (26918564).

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

21337420 is a wasteful number, since it uses less digits than its factorization.

21337420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82089 (or 82087 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 21337420 is about 4619.2445269762. The cubic root of 21337420 is about 277.3622182121.

The spelling of 21337420 in words is "twenty-one million, three hundred thirty-seven thousand, four hundred twenty".