221138076 has 12 divisors (see below), whose sum is σ = 515988872. Its totient is φ = 73712688.

The previous prime is 221138041. The next prime is 221138089. The reversal of 221138076 is 670831122.

221138076 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

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, 9214075 + ... + 9214098.

Almost surely, 2^221138076 is an apocalyptic number.

It is an amenable number.

221138076 is an abundant number, since it is smaller than the sum of its proper divisors (294850796).

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

221138076 is a wasteful number, since it uses less digits than its factorization.

221138076 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18428180 (or 18428178 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 221138076 is about 14870.7120206129. The cubic root of 221138076 is about 604.7202458627.

Adding to 221138076 its reverse (670831122), we get a palindrome (891969198).

The spelling of 221138076 in words is "two hundred twenty-one million, one hundred thirty-eight thousand, seventy-six".