221243142 has 16 divisors (see below), whose sum is σ = 447459120. Its totient is φ = 72918912.

The previous prime is 221243137. The next prime is 221243153. The reversal of 221243142 is 241342122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 206623 + ... + 207690.

It is an arithmetic number, because the mean of its divisors is an integer number (27966195).

Almost surely, 2^221243142 is an apocalyptic number.

221243142 is an abundant number, since it is smaller than the sum of its proper divisors (226215978).

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

221243142 is a wasteful number, since it uses less digits than its factorization.

221243142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414407.

The product of its digits is 768, while the sum is 21.

The square root of 221243142 is about 14874.2442497090. The cubic root of 221243142 is about 604.8160012371.

Adding to 221243142 its reverse (241342122), we get a palindrome (462585264).

It can be divided in two parts, 2212 and 43142, that added together give a palindrome (45354).

The spelling of 221243142 in words is "two hundred twenty-one million, two hundred forty-three thousand, one hundred forty-two".