221555132 has 6 divisors (see below), whose sum is σ = 387721488. Its totient is φ = 110777564.

The previous prime is 221555123. The next prime is 221555153. The reversal of 221555132 is 231555122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27694388 + ... + 27694395.

It is an arithmetic number, because the mean of its divisors is an integer number (64620248).

Almost surely, 2^221555132 is an apocalyptic number.

It is an amenable number.

221555132 is a deficient number, since it is larger than the sum of its proper divisors (166166356).

221555132 is a wasteful number, since it uses less digits than its factorization.

221555132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55388787 (or 55388785 counting only the distinct ones).

The product of its digits is 3000, while the sum is 26.

The square root of 221555132 is about 14884.7281466609. The cubic root of 221555132 is about 605.1001650971.

The spelling of 221555132 in words is "two hundred twenty-one million, five hundred fifty-five thousand, one hundred thirty-two".