21230760 has 32 divisors (see below), whose sum is σ = 63692640. Its totient is φ = 5661504.

The previous prime is 21230749. The next prime is 21230761. The reversal of 21230760 is 6703212.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21230761) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88342 + ... + 88581.

It is an arithmetic number, because the mean of its divisors is an integer number (1990395).

Almost surely, 2^21230760 is an apocalyptic number.

21230760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21230760 is an abundant number, since it is smaller than the sum of its proper divisors (42461880).

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

21230760 is a wasteful number, since it uses less digits than its factorization.

21230760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176937 (or 176933 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 21230760 is about 4607.6848850589. The cubic root of 21230760 is about 276.8992930666.

Adding to 21230760 its reverse (6703212), we get a palindrome (27933972).

The spelling of 21230760 in words is "twenty-one million, two hundred thirty thousand, seven hundred sixty".