221431142 has 4 divisors (see below), whose sum is σ = 332146716. Its totient is φ = 110715570.

The previous prime is 221431141. The next prime is 221431169. The reversal of 221431142 is 241134122.

221431142 is digitally balanced in base 2, 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 is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221431141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55357784 + ... + 55357787.

It is an arithmetic number, because the mean of its divisors is an integer number (83036679).

Almost surely, 2^221431142 is an apocalyptic number.

221431142 is a deficient number, since it is larger than the sum of its proper divisors (110715574).

221431142 is a wasteful number, since it uses less digits than its factorization.

221431142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110715573.

The product of its digits is 384, while the sum is 20.

The square root of 221431142 is about 14880.5625565702. The cubic root of 221431142 is about 604.9872656291.

Adding to 221431142 its reverse (241134122), we get a palindrome (462565264).

The spelling of 221431142 in words is "two hundred twenty-one million, four hundred thirty-one thousand, one hundred forty-two".