21449396 has 24 divisors (see below), whose sum is σ = 39701760. Its totient is φ = 10123200.

The previous prime is 21449387. The next prime is 21449413. The reversal of 21449396 is 69394412.

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, 2975 + ... + 7193.

It is an arithmetic number, because the mean of its divisors is an integer number (1654240).

Almost surely, 2^21449396 is an apocalyptic number.

It is an amenable number.

21449396 is a deficient number, since it is larger than the sum of its proper divisors (18252364).

21449396 is a wasteful number, since it uses less digits than its factorization.

21449396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4295 (or 4293 counting only the distinct ones).

The product of its digits is 46656, while the sum is 38.

The square root of 21449396 is about 4631.3492634436. The cubic root of 21449396 is about 277.8465588728.

The spelling of 21449396 in words is "twenty-one million, four hundred forty-nine thousand, three hundred ninety-six".