1231451253421 has 4 divisors (see below), whose sum is σ = 1248795637344. Its totient is φ = 1214106869500.

The previous prime is 1231451253419. The next prime is 1231451253443. The reversal of 1231451253421 is 1243521541321.

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.

It is a cyclic number.

It is not a de Polignac number, because 1231451253421 - 2¹ = 1231451253419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231451253451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8672191855 + ... + 8672191996.

It is an arithmetic number, because the mean of its divisors is an integer number (312198909336).

Almost surely, 2^{1231451253421} is an apocalyptic number.

It is an amenable number.

1231451253421 is a deficient number, since it is larger than the sum of its proper divisors (17344383923).

1231451253421 is an equidigital number, since it uses as much as digits as its factorization.

1231451253421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17344383922.

The product of its digits is 28800, while the sum is 34.

Adding to 1231451253421 its reverse (1243521541321), we get a palindrome (2474972794742).

The spelling of 1231451253421 in words is "one trillion, two hundred thirty-one billion, four hundred fifty-one million, two hundred fifty-three thousand, four hundred twenty-one".