1211222131013 has 4 divisors (see below), whose sum is σ = 1212112082508. Its totient is φ = 1210332179520.

The previous prime is 1211222130997. The next prime is 1211222131019. The reversal of 1211222131013 is 3101312221121.

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 60800710084 + 1150421420929 = 246578^2 + 1072577^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211222131013 - 2⁴ = 1211222130997 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 (1211222131019) 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, 444973706 + ... + 444976427.

It is an arithmetic number, because the mean of its divisors is an integer number (303028020627).

Almost surely, 2^{1211222131013} is an apocalyptic number.

It is an amenable number.

1211222131013 is a deficient number, since it is larger than the sum of its proper divisors (889951495).

1211222131013 is an equidigital number, since it uses as much as digits as its factorization.

1211222131013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 889951494.

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

Adding to 1211222131013 its reverse (3101312221121), we get a palindrome (4312534352134).

The spelling of 1211222131013 in words is "one trillion, two hundred eleven billion, two hundred twenty-two million, one hundred thirty-one thousand, thirteen".