221129912 has 16 divisors (see below), whose sum is σ = 432645840. Its totient is φ = 105757696.

The previous prime is 221129903. The next prime is 221129917. The reversal of 221129912 is 219921122.

221129912 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×221129912² = 97796875962255488, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221129917) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 600713 + ... + 601080.

It is an arithmetic number, because the mean of its divisors is an integer number (27040365).

Almost surely, 2^221129912 is an apocalyptic number.

It is an amenable number.

221129912 is a deficient number, since it is larger than the sum of its proper divisors (211515928).

221129912 is a wasteful number, since it uses less digits than its factorization.

221129912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1201822 (or 1201818 counting only the distinct ones).

The product of its digits is 1296, while the sum is 29.

The square root of 221129912 is about 14870.4375187820. The cubic root of 221129912 is about 604.7128040614.

It can be divided in two parts, 2211 and 29912, that added together give a palindrome (32123).

The spelling of 221129912 in words is "two hundred twenty-one million, one hundred twenty-nine thousand, nine hundred twelve".