21193449 has 8 divisors (see below), whose sum is σ = 28737120. Its totient is φ = 13889376.

The previous prime is 21193427. The next prime is 21193463. The reversal of 21193449 is 94439112.

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

It is not a de Polignac number, because 21193449 - 2⁷ = 21193321 is a prime.

It is not an unprimeable number, because it can be changed into a prime (29193449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59692 + ... + 60045.

It is an arithmetic number, because the mean of its divisors is an integer number (3592140).

Almost surely, 2^21193449 is an apocalyptic number.

It is an amenable number.

21193449 is a deficient number, since it is larger than the sum of its proper divisors (7543671).

21193449 is a wasteful number, since it uses less digits than its factorization.

21193449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119799.

The product of its digits is 7776, while the sum is 33.

The square root of 21193449 is about 4603.6343251827. The cubic root of 21193449 is about 276.7369900751.

The spelling of 21193449 in words is "twenty-one million, one hundred ninety-three thousand, four hundred forty-nine".