1142023221 has 6 divisors (see below), whose sum is σ = 1649589110. Its totient is φ = 761348808.

The previous prime is 1142023213. The next prime is 1142023237. The reversal of 1142023221 is 1223202411.

It is a happy number.

1142023221 is a `hidden beast` number, since 1 + 1 + 420 + 23 + 221 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1023104196 + 118919025 = 31986^2 + 10905^2 .

It is not a de Polignac number, because 1142023221 - 2³ = 1142023213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1142023194 and 1142023203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1142028221) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 63445726 + ... + 63445743.

Almost surely, 2^1142023221 is an apocalyptic number.

It is an amenable number.

1142023221 is a deficient number, since it is larger than the sum of its proper divisors (507565889).

1142023221 is a wasteful number, since it uses less digits than its factorization.

1142023221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126891475 (or 126891472 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 1142023221 is about 33793.8340677704. The cubic root of 1142023221 is about 1045.2615573544.

Adding to 1142023221 its reverse (1223202411), we get a palindrome (2365225632).

The spelling of 1142023221 in words is "one billion, one hundred forty-two million, twenty-three thousand, two hundred twenty-one".