21132280 has 32 divisors (see below), whose sum is σ = 51206400. Its totient is φ = 7802496.

The previous prime is 21132277. The next prime is 21132289. The reversal of 21132280 is 8223112.

It is a super-3 number, since 3×21132280³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21132289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19800 + ... + 20839.

It is an arithmetic number, because the mean of its divisors is an integer number (1600200).

Almost surely, 2^21132280 is an apocalyptic number.

21132280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21132280 is an abundant number, since it is smaller than the sum of its proper divisors (30074120).

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

21132280 is a wasteful number, since it uses less digits than its factorization.

21132280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40663 (or 40659 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 21132280 is about 4596.9859690889. The cubic root of 21132280 is about 276.4704920512.

Adding to 21132280 its reverse (8223112), we get a palindrome (29355392).

It can be divided in two parts, 21132 and 280, that added together give a palindrome (21412).

The spelling of 21132280 in words is "twenty-one million, one hundred thirty-two thousand, two hundred eighty".