221121449 has 8 divisors (see below), whose sum is σ = 233160000. Its totient is φ = 209122992.

The previous prime is 221121443. The next prime is 221121493. The reversal of 221121449 is 944121122.

221121449 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221121449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221121443) 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, 1667 + ... + 21095.

It is an arithmetic number, because the mean of its divisors is an integer number (29145000).

Almost surely, 2^221121449 is an apocalyptic number.

It is an amenable number.

221121449 is a deficient number, since it is larger than the sum of its proper divisors (12038551).

221121449 is a wasteful number, since it uses less digits than its factorization.

221121449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20047.

The product of its digits is 1152, while the sum is 26.

The square root of 221121449 is about 14870.1529581911. The cubic root of 221121449 is about 604.7050895168.

The spelling of 221121449 in words is "two hundred twenty-one million, one hundred twenty-one thousand, four hundred forty-nine".