221573139 has 8 divisors (see below), whose sum is σ = 298192320. Its totient is φ = 146334696.

The previous prime is 221573101. The next prime is 221573147. The reversal of 221573139 is 931375122.

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

It is not a de Polignac number, because 221573139 - 2⁹ = 221572627 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221573159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 344809 + ... + 345450.

It is an arithmetic number, because the mean of its divisors is an integer number (37274040).

Almost surely, 2^221573139 is an apocalyptic number.

221573139 is a deficient number, since it is larger than the sum of its proper divisors (76619181).

221573139 is a wasteful number, since it uses less digits than its factorization.

221573139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 690369.

The product of its digits is 11340, while the sum is 33.

The square root of 221573139 is about 14885.3330160934. Note that the first 3 decimals coincide. The cubic root of 221573139 is about 605.1165579221.

The spelling of 221573139 in words is "two hundred twenty-one million, five hundred seventy-three thousand, one hundred thirty-nine".