21322260 has 36 divisors (see below), whose sum is σ = 64678068. Its totient is φ = 5685888.

The previous prime is 21322241. The next prime is 21322277. The reversal of 21322260 is 6222312.

It can be written as a sum of positive squares in 2 ways, for example, as 16499844 + 4822416 = 4062^2 + 2196^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

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, 59049 + ... + 59408.

It is an arithmetic number, because the mean of its divisors is an integer number (1796613).

Almost surely, 2^21322260 is an apocalyptic number.

21322260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21322260 is an abundant number, since it is smaller than the sum of its proper divisors (43355808).

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

21322260 is a wasteful number, since it uses less digits than its factorization.

21322260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118472 (or 118467 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 21322260 is about 4617.6032744271. The cubic root of 21322260 is about 277.2965150570.

Adding to 21322260 its reverse (6222312), we get a palindrome (27544572).

The spelling of 21322260 in words is "twenty-one million, three hundred twenty-two thousand, two hundred sixty".