1211222131011 has 24 divisors (see below), whose sum is σ = 1779040852160. Its totient is φ = 793951891200.

The previous prime is 1211222130997. The next prime is 1211222131019. The reversal of 1211222131011 is 1101312221121.

It is a happy number.

1211222131011 is a `hidden beast` number, since 12 + 112 + 221 + 310 + 11 = 666.

It is not a de Polignac number, because 1211222131011 - 2³⁰ = 1210148389187 is a prime.

It is a Duffinian 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 23 ways as a sum of consecutive naturals, for example, 3362980 + ... + 3705681.

Almost surely, 2^{1211222131011} is an apocalyptic number.

1211222131011 is a deficient number, since it is larger than the sum of its proper divisors (567818721149).

1211222131011 is a wasteful number, since it uses less digits than its factorization.

1211222131011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7068987 (or 7068984 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 1211222131011 its reverse (1101312221121), we get a palindrome (2312534352132).

The spelling of 1211222131011 in words is "one trillion, two hundred eleven billion, two hundred twenty-two million, one hundred thirty-one thousand, eleven".