221644330 has 32 divisors (see below), whose sum is σ = 417187584. Its totient is φ = 84623616.

The previous prime is 221644309. The next prime is 221644333. The reversal of 221644330 is 33446122.

It is a super-2 number, since 2×221644330² = 98252418042297800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221644295 and 221644304.

It is not an unprimeable number, because it can be changed into a prime (221644333) 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, 170242 + ... + 171538.

It is an arithmetic number, because the mean of its divisors is an integer number (13037112).

Almost surely, 2^221644330 is an apocalyptic number.

221644330 is a deficient number, since it is larger than the sum of its proper divisors (195543254).

221644330 is a wasteful number, since it uses less digits than its factorization.

221644330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2070.

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 221644330 is about 14887.7241376914. The cubic root of 221644330 is about 605.1813585566.

The spelling of 221644330 in words is "two hundred twenty-one million, six hundred forty-four thousand, three hundred thirty".