221321249 has 16 divisors (see below), whose sum is σ = 246509568. Its totient is φ = 197632512.

The previous prime is 221321209. The next prime is 221321251. The reversal of 221321249 is 942123122.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221321249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221321209) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47429 + ... + 51885.

It is an arithmetic number, because the mean of its divisors is an integer number (15406848).

Almost surely, 2^221321249 is an apocalyptic number.

It is an amenable number.

221321249 is a deficient number, since it is larger than the sum of its proper divisors (25188319).

221321249 is a wasteful number, since it uses less digits than its factorization.

221321249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4624.

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

The square root of 221321249 is about 14876.8695967935. The cubic root of 221321249 is about 604.8871669915.

The spelling of 221321249 in words is "two hundred twenty-one million, three hundred twenty-one thousand, two hundred forty-nine".