21274260 has 96 divisors (see below), whose sum is σ = 69968640. Its totient is φ = 4731264.

The previous prime is 21274249. The next prime is 21274261. The reversal of 21274260 is 6247212.

It is a self number, because there is not a number n which added to its sum of digits gives 21274260.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21274261) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 574962 + ... + 574998.

It is an arithmetic number, because the mean of its divisors is an integer number (728840).

Almost surely, 2^21274260 is an apocalyptic number.

21274260 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 21274260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34984320).

21274260 is an abundant number, since it is smaller than the sum of its proper divisors (48694380).

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

21274260 is an equidigital number, since it uses as much as digits as its factorization.

21274260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130 (or 54 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 21274260 is about 4612.4028445052. The cubic root of 21274260 is about 277.0882783271.

The spelling of 21274260 in words is "twenty-one million, two hundred seventy-four thousand, two hundred sixty".