1211231122013 has 4 divisors (see below), whose sum is σ = 1321343042208. Its totient is φ = 1101119201820.

The previous prime is 1211231121941. The next prime is 1211231122033. The reversal of 1211231122013 is 3102211321121.

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 not a de Polignac number, because 1211231122013 - 2¹⁰ = 1211231120989 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 (1211231122033) 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, 55055960081 + ... + 55055960102.

It is an arithmetic number, because the mean of its divisors is an integer number (330335760552).

Almost surely, 2^{1211231122013} is an apocalyptic number.

It is an amenable number.

1211231122013 is a deficient number, since it is larger than the sum of its proper divisors (110111920195).

1211231122013 is a wasteful number, since it uses less digits than its factorization.

1211231122013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110111920194.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 1211231122013 its reverse (3102211321121), we get a palindrome (4313442443134).

The spelling of 1211231122013 in words is "one trillion, two hundred eleven billion, two hundred thirty-one million, one hundred twenty-two thousand, thirteen".