221670389 has 8 divisors (see below), whose sum is σ = 232975680. Its totient is φ = 210504096.

The previous prime is 221670373. The next prime is 221670439. The reversal of 221670389 is 983076122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221670389 - 2⁴ = 221670373 is a prime.

It is a super-2 number, since 2×221670389² = 98275522718822642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221670329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31472 + ... + 37865.

It is an arithmetic number, because the mean of its divisors is an integer number (29121960).

Almost surely, 2^221670389 is an apocalyptic number.

It is an amenable number.

221670389 is a deficient number, since it is larger than the sum of its proper divisors (11305291).

221670389 is a wasteful number, since it uses less digits than its factorization.

221670389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69499.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 221670389 is about 14888.5992961057. The cubic root of 221670389 is about 605.2050749359.

The spelling of 221670389 in words is "two hundred twenty-one million, six hundred seventy thousand, three hundred eighty-nine".