1211222122011 has 24 divisors (see below), whose sum is σ = 1979281047744. Its totient is φ = 734074011720.

The previous prime is 1211222121983. The next prime is 1211222122037. The reversal of 1211222122011 is 1102212221121.

1211222122011 is a `hidden beast` number, since 1 + 211 + 2 + 221 + 220 + 11 = 666.

It is not a de Polignac number, because 1211222122011 - 2⁵ = 1211222121979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211222122081) 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, 226563381 + ... + 226568726.

It is an arithmetic number, because the mean of its divisors is an integer number (82470043656).

Almost surely, 2^{1211222122011} is an apocalyptic number.

1211222122011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1211222122011 is a deficient number, since it is larger than the sum of its proper divisors (768058925733).

1211222122011 is an equidigital number, since it uses as much as digits as its factorization.

1211222122011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 453132133 (or 453132121 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1211222122011 its reverse (1102212221121), we get a palindrome (2313434343132).

The spelling of 1211222122011 in words is "one trillion, two hundred eleven billion, two hundred twenty-two million, one hundred twenty-two thousand, eleven".