1231231421 has 8 divisors (see below), whose sum is σ = 1415755584. Its totient is φ = 1048865760.

The previous prime is 1231231387. The next prime is 1231231457. The reversal of 1231231421 is 1241321321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1231231421 - 2⁶ = 1231231357 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1231231393 and 1231231402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231231481) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 538400 + ... + 540681.

It is an arithmetic number, because the mean of its divisors is an integer number (176969448).

Almost surely, 2^1231231421 is an apocalyptic number.

It is an amenable number.

1231231421 is a deficient number, since it is larger than the sum of its proper divisors (184524163).

1231231421 is a wasteful number, since it uses less digits than its factorization.

1231231421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1079251.

The product of its digits is 288, while the sum is 20.

The square root of 1231231421 is about 35088.9073782584. The cubic root of 1231231421 is about 1071.7987101292.

Adding to 1231231421 its reverse (1241321321), we get a palindrome (2472552742).

The spelling of 1231231421 in words is "one billion, two hundred thirty-one million, two hundred thirty-one thousand, four hundred twenty-one".