221981910 has 32 divisors (see below), whose sum is σ = 545149440. Its totient is φ = 57818208.

The previous prime is 221981909. The next prime is 221981927. The reversal of 221981910 is 19189122.

221981910 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84750 + ... + 87329.

It is an arithmetic number, because the mean of its divisors is an integer number (17035920).

Almost surely, 2^221981910 is an apocalyptic number.

221981910 is an abundant number, since it is smaller than the sum of its proper divisors (323167530).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221981910 is a wasteful number, since it uses less digits than its factorization.

221981910 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172132.

The product of its (nonzero) digits is 2592, while the sum is 33.

The square root of 221981910 is about 14899.0573527321. The cubic root of 221981910 is about 605.4884473822.

The spelling of 221981910 in words is "two hundred twenty-one million, nine hundred eighty-one thousand, nine hundred ten".