1140202421 has 4 divisors (see below), whose sum is σ = 1140876012. Its totient is φ = 1139528832.

The previous prime is 1140202387. The next prime is 1140202463. The reversal of 1140202421 is 1242020411.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1242020411 = 6577 ⋅188843.

It can be written as a sum of positive squares in 2 ways, for example, as 637815025 + 502387396 = 25255^2 + 22414^2 .

It is a cyclic number.

It is not a de Polignac number, because 1140202421 - 2²² = 1136008117 is a prime.

It is a super-2 number, since 2×1140202421² = 2600123121708522482, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1140202421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1140202321) 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, 334250 + ... + 337643.

It is an arithmetic number, because the mean of its divisors is an integer number (285219003).

Almost surely, 2^1140202421 is an apocalyptic number.

It is an amenable number.

1140202421 is a deficient number, since it is larger than the sum of its proper divisors (673591).

1140202421 is an equidigital number, since it uses as much as digits as its factorization.

1140202421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 673590.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 1140202421 is about 33766.8834955197. The cubic root of 1140202421 is about 1044.7057529492.

Adding to 1140202421 its reverse (1242020411), we get a palindrome (2382222832).

The spelling of 1140202421 in words is "one billion, one hundred forty million, two hundred two thousand, four hundred twenty-one".