21023060 has 12 divisors (see below), whose sum is σ = 44148468. Its totient is φ = 8409216.

The previous prime is 21023047. The next prime is 21023077. The reversal of 21023060 is 6032012.

It can be written as a sum of positive squares in 2 ways, for example, as 15649936 + 5373124 = 3956^2 + 2318^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 525557 + ... + 525596.

It is an arithmetic number, because the mean of its divisors is an integer number (3679039).

Almost surely, 2^21023060 is an apocalyptic number.

21023060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21023060 is an abundant number, since it is smaller than the sum of its proper divisors (23125408).

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

21023060 is a wasteful number, since it uses less digits than its factorization.

21023060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1051162 (or 1051160 counting only the distinct ones).

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

The square root of 21023060 is about 4585.0910568930. The cubic root of 21023060 is about 275.9933660801.

Adding to 21023060 its reverse (6032012), we get a palindrome (27055072).

The spelling of 21023060 in words is "twenty-one million, twenty-three thousand, sixty".