21337460 has 36 divisors (see below), whose sum is σ = 45954468. Its totient is φ = 8322048.

The previous prime is 21337457. The next prime is 21337471. The reversal of 21337460 is 6473312.

It can be written as a sum of positive squares in 2 ways, for example, as 16337764 + 4999696 = 4042^2 + 2236^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36692 + ... + 37268.

It is an arithmetic number, because the mean of its divisors is an integer number (1276513).

Almost surely, 2^21337460 is an apocalyptic number.

21337460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21337460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22977234).

21337460 is an abundant number, since it is smaller than the sum of its proper divisors (24617008).

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

21337460 is a wasteful number, since it uses less digits than its factorization.

21337460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 672 (or 627 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 26.

The square root of 21337460 is about 4619.2488566866. The cubic root of 21337460 is about 277.3623915302.

It can be divided in two parts, 213 and 37460, that added together give a palindrome (37673).

The spelling of 21337460 in words is "twenty-one million, three hundred thirty-seven thousand, four hundred sixty".