221552313 has 24 divisors (see below), whose sum is σ = 320537472. Its totient is φ = 136030464.

The previous prime is 221552311. The next prime is 221552327. The reversal of 221552313 is 313255122.

It is a happy number.

It is not a de Polignac number, because 221552313 - 2¹ = 221552311 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221552311) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38031 + ... + 43467.

It is an arithmetic number, because the mean of its divisors is an integer number (13355728).

Almost surely, 2^221552313 is an apocalyptic number.

It is an amenable number.

221552313 is a deficient number, since it is larger than the sum of its proper divisors (98985159).

221552313 is a wasteful number, since it uses less digits than its factorization.

221552313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5521 (or 5504 counting only the distinct ones).

The product of its digits is 1800, while the sum is 24.

The square root of 221552313 is about 14884.6334519866. The cubic root of 221552313 is about 605.0975987162.

The spelling of 221552313 in words is "two hundred twenty-one million, five hundred fifty-two thousand, three hundred thirteen".