21303140 has 48 divisors (see below), whose sum is σ = 46099200. Its totient is φ = 8266752.

The previous prime is 21303137. The next prime is 21303143. The reversal of 21303140 is 4130312.

It is an interprime number because it is at equal distance from previous prime (21303137) and next prime (21303143).

It is not an unprimeable number, because it can be changed into a prime (21303143) 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 15 ways as a sum of consecutive naturals, for example, 153191 + ... + 153329.

It is an arithmetic number, because the mean of its divisors is an integer number (960400).

Almost surely, 2^21303140 is an apocalyptic number.

21303140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21303140 is an abundant number, since it is smaller than the sum of its proper divisors (24796060).

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

21303140 is a wasteful number, since it uses less digits than its factorization.

21303140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324 (or 322 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 21303140 is about 4615.5324719906. The cubic root of 21303140 is about 277.2136049133.

Adding to 21303140 its reverse (4130312), we get a palindrome (25433452).

The spelling of 21303140 in words is "twenty-one million, three hundred three thousand, one hundred forty".