221561044 has 12 divisors (see below), whose sum is σ = 401102100. Its totient is φ = 106960448.

The previous prime is 221560991. The next prime is 221561057. The reversal of 221561044 is 440165122.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 155301444 + 66259600 = 12462^2 + 8140^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 954889 + ... + 955120.

It is an arithmetic number, because the mean of its divisors is an integer number (33425175).

Almost surely, 2^221561044 is an apocalyptic number.

It is an amenable number.

221561044 is a deficient number, since it is larger than the sum of its proper divisors (179541056).

221561044 is a wasteful number, since it uses less digits than its factorization.

221561044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1910042 (or 1910040 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 221561044 is about 14884.9267381469. The cubic root of 221561044 is about 605.1055472343.

The spelling of 221561044 in words is "two hundred twenty-one million, five hundred sixty-one thousand, forty-four".