221921146 has 4 divisors (see below), whose sum is σ = 332881722. Its totient is φ = 110960572.

The previous prime is 221921143. The next prime is 221921177. The reversal of 221921146 is 641129122.

221921146 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 169286121 + 52635025 = 13011^2 + 7255^2 .

It is not an unprimeable number, because it can be changed into a prime (221921143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55480285 + ... + 55480288.

Almost surely, 2^221921146 is an apocalyptic number.

221921146 is a deficient number, since it is larger than the sum of its proper divisors (110960576).

221921146 is a wasteful number, since it uses less digits than its factorization.

221921146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110960575.

The product of its digits is 1728, while the sum is 28.

The square root of 221921146 is about 14897.0180237523. The cubic root of 221921146 is about 605.4331947454.

The spelling of 221921146 in words is "two hundred twenty-one million, nine hundred twenty-one thousand, one hundred forty-six".