21449398 has 8 divisors (see below), whose sum is σ = 32231592. Its totient is φ = 10705536.

The previous prime is 21449387. The next prime is 21449413. The reversal of 21449398 is 89394412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21449398.

It is a congruent number.

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, 8140 + ... + 10447.

It is an arithmetic number, because the mean of its divisors is an integer number (4028949).

Almost surely, 2^21449398 is an apocalyptic number.

21449398 is a deficient number, since it is larger than the sum of its proper divisors (10782194).

21449398 is a wasteful number, since it uses less digits than its factorization.

21449398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19166.

The product of its digits is 62208, while the sum is 40.

The square root of 21449398 is about 4631.3494793634. The cubic root of 21449398 is about 277.8465675085.

The spelling of 21449398 in words is "twenty-one million, four hundred forty-nine thousand, three hundred ninety-eight".