221545313 has 12 divisors (see below), whose sum is σ = 251376384. Its totient is φ = 194904600.

The previous prime is 221545283. The next prime is 221545321. The reversal of 221545313 is 313545122.

It is a happy number.

It is not a de Polignac number, because 221545313 - 2⁶ = 221545249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221545013) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25781 + ... + 33282.

It is an arithmetic number, because the mean of its divisors is an integer number (20948032).

Almost surely, 2^221545313 is an apocalyptic number.

It is an amenable number.

221545313 is a deficient number, since it is larger than the sum of its proper divisors (29831071).

221545313 is a wasteful number, since it uses less digits than its factorization.

221545313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59116 (or 59105 counting only the distinct ones).

The product of its digits is 3600, while the sum is 26.

The square root of 221545313 is about 14884.3983082958. The cubic root of 221545313 is about 605.0912259131.

The spelling of 221545313 in words is "two hundred twenty-one million, five hundred forty-five thousand, three hundred thirteen".