1231213222011 has 16 divisors (see below), whose sum is σ = 1648927073664. Its totient is φ = 817154433984.

The previous prime is 1231213221991. The next prime is 1231213222033. The reversal of 1231213222011 is 1102223121321.

It is not a de Polignac number, because 1231213222011 - 2¹⁰ = 1231213220987 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1231213222051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27562951 + ... + 27607583.

It is an arithmetic number, because the mean of its divisors is an integer number (103057942104).

Almost surely, 2^{1231213222011} is an apocalyptic number.

1231213222011 is a deficient number, since it is larger than the sum of its proper divisors (417713851653).

1231213222011 is a wasteful number, since it uses less digits than its factorization.

1231213222011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85370.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 1231213222011 its reverse (1102223121321), we get a palindrome (2333436343332).

The spelling of 1231213222011 in words is "one trillion, two hundred thirty-one billion, two hundred thirteen million, two hundred twenty-two thousand, eleven".