1201222211111 has 16 divisors (see below), whose sum is σ = 1355246484480. Its totient is φ = 1056385308000.

The previous prime is 1201222211107. The next prime is 1201222211117. The reversal of 1201222211111 is 1111122221021.

It is not a de Polignac number, because 1201222211111 - 2² = 1201222211107 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1201222211111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201222211117) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7927871 + ... + 8077968.

It is an arithmetic number, because the mean of its divisors is an integer number (84702905280).

Almost surely, 2^{1201222211111} is an apocalyptic number.

1201222211111 is a deficient number, since it is larger than the sum of its proper divisors (154024273369).

1201222211111 is a wasteful number, since it uses less digits than its factorization.

1201222211111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16006126.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 1201222211111 its reverse (1111122221021), we get a palindrome (2312344432132).

The spelling of 1201222211111 in words is "one trillion, two hundred one billion, two hundred twenty-two million, two hundred eleven thousand, one hundred eleven".