1421131231 has 4 divisors (see below), whose sum is σ = 1530449032. Its totient is φ = 1311813432.

The previous prime is 1421131193. The next prime is 1421131301. The reversal of 1421131231 is 1321311241.

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

It is a cyclic number.

It is not a de Polignac number, because 1421131231 - 2¹⁷ = 1421000159 is a prime.

It is a super-2 number, since 2×1421131231² = 4039227951447150722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1421131199 and 1421131208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1421131331) 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, 54658881 + ... + 54658906.

It is an arithmetic number, because the mean of its divisors is an integer number (382612258).

Almost surely, 2^1421131231 is an apocalyptic number.

1421131231 is a deficient number, since it is larger than the sum of its proper divisors (109317801).

1421131231 is a wasteful number, since it uses less digits than its factorization.

1421131231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109317800.

The product of its digits is 144, while the sum is 19.

The square root of 1421131231 is about 37697.8942515361. The cubic root of 1421131231 is about 1124.2892579987.

Adding to 1421131231 its reverse (1321311241), we get a palindrome (2742442472).

The spelling of 1421131231 in words is "one billion, four hundred twenty-one million, one hundred thirty-one thousand, two hundred thirty-one".