1142040421 has 4 divisors (see below), whose sum is σ = 1142556844. Its totient is φ = 1141524000.

The previous prime is 1142040401. The next prime is 1142040439. The reversal of 1142040421 is 1240402411.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 853516225 + 288524196 = 29215^2 + 16986^2 .

It is a cyclic number.

It is not a de Polignac number, because 1142040421 - 2⁷ = 1142040293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1142040401) 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, 254880 + ... + 259321.

It is an arithmetic number, because the mean of its divisors is an integer number (285639211).

Almost surely, 2^1142040421 is an apocalyptic number.

It is an amenable number.

1142040421 is a deficient number, since it is larger than the sum of its proper divisors (516423).

1142040421 is an equidigital number, since it uses as much as digits as its factorization.

1142040421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516422.

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 1142040421 is about 33794.0885511061. The cubic root of 1142040421 is about 1045.2668048859.

Adding to 1142040421 its reverse (1240402411), we get a palindrome (2382442832).

The spelling of 1142040421 in words is "one billion, one hundred forty-two million, forty thousand, four hundred twenty-one".