1142052221 has 4 divisors (see below), whose sum is σ = 1148031744. Its totient is φ = 1136072700.

The previous prime is 1142052169. The next prime is 1142052227. The reversal of 1142052221 is 1222502411.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1222502411 = 13 ⋅94038647.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1142052221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1142052193 and 1142052202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1142052227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2989475 + ... + 2989856.

It is an arithmetic number, because the mean of its divisors is an integer number (287007936).

Almost surely, 2^1142052221 is an apocalyptic number.

It is an amenable number.

1142052221 is a deficient number, since it is larger than the sum of its proper divisors (5979523).

1142052221 is an equidigital number, since it uses as much as digits as its factorization.

1142052221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5979522.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 1142052221 is about 33794.2631374025. The cubic root of 1142052221 is about 1045.2704049061.

Adding to 1142052221 its reverse (1222502411), we get a palindrome (2364554632).

The spelling of 1142052221 in words is "one billion, one hundred forty-two million, fifty-two thousand, two hundred twenty-one".