221145884 has 6 divisors (see below), whose sum is σ = 387005304. Its totient is φ = 110572940.

The previous prime is 221145871. The next prime is 221145889. The reversal of 221145884 is 488541122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221145889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27643232 + ... + 27643239.

It is an arithmetic number, because the mean of its divisors is an integer number (64500884).

Almost surely, 2^221145884 is an apocalyptic number.

It is an amenable number.

221145884 is a deficient number, since it is larger than the sum of its proper divisors (165859420).

221145884 is a wasteful number, since it uses less digits than its factorization.

221145884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55286475 (or 55286473 counting only the distinct ones).

The product of its digits is 20480, while the sum is 35.

The square root of 221145884 is about 14870.9745477558. The cubic root of 221145884 is about 604.7273629849.

The spelling of 221145884 in words is "two hundred twenty-one million, one hundred forty-five thousand, eight hundred eighty-four".