21337284 has 48 divisors (see below), whose sum is σ = 52553088. Its totient is φ = 6724608.

The previous prime is 21337279. The next prime is 21337297. The reversal of 21337284 is 48273312.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26374 + ... + 27170.

It is an arithmetic number, because the mean of its divisors is an integer number (1094856).

Almost surely, 2^21337284 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21337284, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26276544).

21337284 is an abundant number, since it is smaller than the sum of its proper divisors (31215804).

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

21337284 is a wasteful number, since it uses less digits than its factorization.

21337284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 924 (or 922 counting only the distinct ones).

The product of its digits is 8064, while the sum is 30.

The square root of 21337284 is about 4619.2298059309. The cubic root of 21337284 is about 277.3616289290.

The spelling of 21337284 in words is "twenty-one million, three hundred thirty-seven thousand, two hundred eighty-four".