221939902 has 4 divisors (see below), whose sum is σ = 332909856. Its totient is φ = 110969950.

The previous prime is 221939873. The next prime is 221939909. The reversal of 221939902 is 209939122.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221939909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55484974 + ... + 55484977.

It is an arithmetic number, because the mean of its divisors is an integer number (83227464).

Almost surely, 2^221939902 is an apocalyptic number.

221939902 is a deficient number, since it is larger than the sum of its proper divisors (110969954).

221939902 is a wasteful number, since it uses less digits than its factorization.

221939902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110969953.

The product of its (nonzero) digits is 17496, while the sum is 37.

The square root of 221939902 is about 14897.6475324126. The cubic root of 221939902 is about 605.4502506311.

The spelling of 221939902 in words is "two hundred twenty-one million, nine hundred thirty-nine thousand, nine hundred two".