21231452 has 24 divisors (see below), whose sum is σ = 40656000. Its totient is φ = 9621360.

The previous prime is 21231449. The next prime is 21231473. The reversal of 21231452 is 25413212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21473 + ... + 22439.

It is an arithmetic number, because the mean of its divisors is an integer number (1694000).

Almost surely, 2^21231452 is an apocalyptic number.

21231452 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21231452 is a deficient number, since it is larger than the sum of its proper divisors (19424548).

21231452 is a wasteful number, since it uses less digits than its factorization.

21231452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1481 (or 1479 counting only the distinct ones).

The product of its digits is 480, while the sum is 20.

The square root of 21231452 is about 4607.7599763877. The cubic root of 21231452 is about 276.9023014724.

Adding to 21231452 its reverse (25413212), we get a palindrome (46644664).

The spelling of 21231452 in words is "twenty-one million, two hundred thirty-one thousand, four hundred fifty-two".