221373321 has 16 divisors (see below), whose sum is σ = 331691136. Its totient is φ = 130306176.

The previous prime is 221373311. The next prime is 221373343. The reversal of 221373321 is 123373122.

221373321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221373321 - 2⁷ = 221373193 is a prime.

It is a super-2 number, since 2×221373321² = 98012294501138082, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221373291 and 221373300.

It is not an unprimeable number, because it can be changed into a prime (221373301) 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, 122500 + ... + 124293.

It is an arithmetic number, because the mean of its divisors is an integer number (20730696).

Almost surely, 2^221373321 is an apocalyptic number.

It is an amenable number.

221373321 is a deficient number, since it is larger than the sum of its proper divisors (110317815).

221373321 is a wasteful number, since it uses less digits than its factorization.

221373321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246832.

The product of its digits is 1512, while the sum is 24.

The square root of 221373321 is about 14878.6195932284. The cubic root of 221373321 is about 604.9346021335.

The spelling of 221373321 in words is "two hundred twenty-one million, three hundred seventy-three thousand, three hundred twenty-one".