1243421143 has 4 divisors (see below), whose sum is σ = 1269876960. Its totient is φ = 1216965328.

The previous prime is 1243421141. The next prime is 1243421171. The reversal of 1243421143 is 3411243421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3411243421 = 631 ⋅5406091.

It is a cyclic number.

It is not a de Polignac number, because 1243421143 - 2¹ = 1243421141 is a prime.

It is a super-2 number, since 2×1243421143² = 3092192277718852898, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243421141) 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, 13227838 + ... + 13227931.

It is an arithmetic number, because the mean of its divisors is an integer number (317469240).

Almost surely, 2^1243421143 is an apocalyptic number.

1243421143 is a deficient number, since it is larger than the sum of its proper divisors (26455817).

1243421143 is an equidigital number, since it uses as much as digits as its factorization.

1243421143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26455816.

The product of its digits is 2304, while the sum is 25.

The square root of 1243421143 is about 35262.1772300010. The cubic root of 1243421143 is about 1075.3241908115.

Adding to 1243421143 its reverse (3411243421), we get a palindrome (4654664564).

The spelling of 1243421143 in words is "one billion, two hundred forty-three million, four hundred twenty-one thousand, one hundred forty-three".