221015944 has 16 divisors (see below), whose sum is σ = 415226700. Its totient is φ = 110288832.

The previous prime is 221015933. The next prime is 221015981. The reversal of 221015944 is 449510122.

221015944 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 220879044 + 136900 = 14862^2 + 370^2 .

It is a super-2 number, since 2×221015944² = 97696095004422272, which contains 22 as substring.

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, 23067 + ... + 31210.

Almost surely, 2^221015944 is an apocalyptic number.

It is an amenable number.

221015944 is a deficient number, since it is larger than the sum of its proper divisors (194210756).

221015944 is a wasteful number, since it uses less digits than its factorization.

221015944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54792 (or 54788 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 221015944 is about 14866.6049923982. The cubic root of 221015944 is about 604.6088986973.

The spelling of 221015944 in words is "two hundred twenty-one million, fifteen thousand, nine hundred forty-four".