21342260 has 48 divisors (see below), whose sum is σ = 47900160. Its totient is φ = 7969920.

The previous prime is 21342257. The next prime is 21342281. The reversal of 21342260 is 6224312.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

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, 17387 + ... + 18573.

It is an arithmetic number, because the mean of its divisors is an integer number (997920).

Almost surely, 2^21342260 is an apocalyptic number.

21342260 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 21342260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23950080).

21342260 is an abundant number, since it is smaller than the sum of its proper divisors (26557900).

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

21342260 is a wasteful number, since it uses less digits than its factorization.

21342260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1256 (or 1254 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 21342260 is about 4619.7683924630. The cubic root of 21342260 is about 277.3831881270.

Adding to 21342260 its reverse (6224312), we get a palindrome (27566572).

The spelling of 21342260 in words is "twenty-one million, three hundred forty-two thousand, two hundred sixty".