1231211321033 has 4 divisors (see below), whose sum is σ = 1231259472768. Its totient is φ = 1231163169300.

The previous prime is 1231211320961. The next prime is 1231211321077. The reversal of 1231211321033 is 3301231121321.

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 1231211321033 - 2²⁶ = 1231144212169 is a prime.

It is a super-4 number, since 4×1231211321033⁴ (a number of 49 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231211321933) 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, 24037493 + ... + 24088658.

It is an arithmetic number, because the mean of its divisors is an integer number (307814868192).

Almost surely, 2^{1231211321033} is an apocalyptic number.

It is an amenable number.

1231211321033 is a deficient number, since it is larger than the sum of its proper divisors (48151735).

1231211321033 is an equidigital number, since it uses as much as digits as its factorization.

1231211321033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48151734.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 1231211321033 its reverse (3301231121321), we get a palindrome (4532442442354).

The spelling of 1231211321033 in words is "one trillion, two hundred thirty-one billion, two hundred eleven million, three hundred twenty-one thousand, thirty-three".