21449312 has 24 divisors (see below), whose sum is σ = 43028496. Its totient is φ = 10521472.

The previous prime is 21449297. The next prime is 21449353. The reversal of 21449312 is 21394412.

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, 4628 + ... + 8019.

It is an arithmetic number, because the mean of its divisors is an integer number (1792854).

Almost surely, 2^21449312 is an apocalyptic number.

It is an amenable number.

21449312 is an abundant number, since it is smaller than the sum of its proper divisors (21579184).

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

21449312 is a wasteful number, since it uses less digits than its factorization.

21449312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12710 (or 12702 counting only the distinct ones).

The product of its digits is 1728, while the sum is 26.

The square root of 21449312 is about 4631.3401948032. The cubic root of 21449312 is about 277.8461961719.

The spelling of 21449312 in words is "twenty-one million, four hundred forty-nine thousand, three hundred twelve".