1231124321 has 4 divisors (see below), whose sum is σ = 1406999232. Its totient is φ = 1055249412.

The previous prime is 1231124311. The next prime is 1231124329. The reversal of 1231124321 is 1234211321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1234211321 = 7 ⋅176315903.

It is not a de Polignac number, because 1231124321 - 2¹⁴ = 1231107937 is a prime.

It is a super-2 number, since 2×1231124321² = 3031334187515422082, 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 = 1231124293 and 1231124302.

It is not an unprimeable number, because it can be changed into a prime (1231124329) 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, 87937445 + ... + 87937458.

It is an arithmetic number, because the mean of its divisors is an integer number (351749808).

Almost surely, 2^1231124321 is an apocalyptic number.

It is an amenable number.

1231124321 is a deficient number, since it is larger than the sum of its proper divisors (175874911).

1231124321 is an equidigital number, since it uses as much as digits as its factorization.

1231124321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175874910.

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

The square root of 1231124321 is about 35087.3812217441. The cubic root of 1231124321 is about 1071.7676320372.

Adding to 1231124321 its reverse (1234211321), we get a palindrome (2465335642).

The spelling of 1231124321 in words is "one billion, two hundred thirty-one million, one hundred twenty-four thousand, three hundred twenty-one".