221153442 has 32 divisors (see below), whose sum is σ = 483439104. Its totient is φ = 67142400.

The previous prime is 221153437. The next prime is 221153447. The reversal of 221153442 is 244351122.

It is an interprime number because it is at equal distance from previous prime (221153437) and next prime (221153447).

It is not an unprimeable number, because it can be changed into a prime (221153447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31809 + ... + 38132.

It is an arithmetic number, because the mean of its divisors is an integer number (15107472).

Almost surely, 2^221153442 is an apocalyptic number.

221153442 is an abundant number, since it is smaller than the sum of its proper divisors (262285662).

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

221153442 is a wasteful number, since it uses less digits than its factorization.

221153442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69994.

The product of its digits is 1920, while the sum is 24.

The square root of 221153442 is about 14871.2286647741. The cubic root of 221153442 is about 604.7342520683.

The spelling of 221153442 in words is "two hundred twenty-one million, one hundred fifty-three thousand, four hundred forty-two".