21452012 has 12 divisors (see below), whose sum is σ = 38414376. Its totient is φ = 10476480.

The previous prime is 21451981. The next prime is 21452021. The reversal of 21452012 is 21025412.

It is a plaindrome in base 11.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 62189 + ... + 62532.

It is an arithmetic number, because the mean of its divisors is an integer number (3201198).

Almost surely, 2^21452012 is an apocalyptic number.

It is an amenable number.

21452012 is a deficient number, since it is larger than the sum of its proper divisors (16962364).

21452012 is a wasteful number, since it uses less digits than its factorization.

21452012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124768 (or 124766 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 21452012 is about 4631.6316779295. The cubic root of 21452012 is about 277.8578539391.

Adding to 21452012 its reverse (21025412), we get a palindrome (42477424).

The spelling of 21452012 in words is "twenty-one million, four hundred fifty-two thousand, twelve".