221133012 has 12 divisors (see below), whose sum is σ = 515977056. Its totient is φ = 73711000.

The previous prime is 221132993. The next prime is 221133061. The reversal of 221133012 is 210331122.

221133012 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 junction number, because it is equal to n+sod(n) for n = 221132982 and 221133000.

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, 9213864 + ... + 9213887.

It is an arithmetic number, because the mean of its divisors is an integer number (42998088).

Almost surely, 2^221133012 is an apocalyptic number.

It is an amenable number.

221133012 is an abundant number, since it is smaller than the sum of its proper divisors (294844044).

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

221133012 is a wasteful number, since it uses less digits than its factorization.

221133012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18427758 (or 18427756 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 221133012 is about 14870.5417520681. The cubic root of 221133012 is about 604.7156298527.

Adding to 221133012 its reverse (210331122), we get a palindrome (431464134).

The spelling of 221133012 in words is "two hundred twenty-one million, one hundred thirty-three thousand, twelve".