1231122021133 has 4 divisors (see below), whose sum is σ = 1247986706428. Its totient is φ = 1214257335840.

The previous prime is 1231122021097. The next prime is 1231122021149. The reversal of 1231122021133 is 3311202211321.

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

It can be written as a sum of positive squares in 2 ways, for example, as 652285600164 + 578836420969 = 807642^2 + 760813^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231122021133 - 2³³ = 1222532086541 is a prime.

It is a super-2 number, since 2×1231122021133² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231122001133) 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, 8432342538 + ... + 8432342683.

It is an arithmetic number, because the mean of its divisors is an integer number (311996676607).

Almost surely, 2^{1231122021133} is an apocalyptic number.

It is an amenable number.

1231122021133 is a deficient number, since it is larger than the sum of its proper divisors (16864685295).

1231122021133 is an equidigital number, since it uses as much as digits as its factorization.

1231122021133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16864685294.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 1231122021133 its reverse (3311202211321), we get a palindrome (4542324232454).

The spelling of 1231122021133 in words is "one trillion, two hundred thirty-one billion, one hundred twenty-two million, twenty-one thousand, one hundred thirty-three".