1211222001111 has 32 divisors (see below), whose sum is σ = 1643954719680. Its totient is φ = 793081036800.

The previous prime is 1211222001061. The next prime is 1211222001113. The reversal of 1211222001111 is 1111002221121.

It is a happy number.

It is not a de Polignac number, because 1211222001111 - 2¹¹ = 1211221999063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211222001113) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 179144971 + ... + 179151731.

It is an arithmetic number, because the mean of its divisors is an integer number (51373584990).

Almost surely, 2^{1211222001111} is an apocalyptic number.

1211222001111 is a deficient number, since it is larger than the sum of its proper divisors (432732718569).

1211222001111 is a wasteful number, since it uses less digits than its factorization.

1211222001111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10147.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1211222001111 its reverse (1111002221121), we get a palindrome (2322224222232).

The spelling of 1211222001111 in words is "one trillion, two hundred eleven billion, two hundred twenty-two million, one thousand, one hundred eleven".