1211222110111 has 8 divisors (see below), whose sum is σ = 1349372112480. Its totient is φ = 1079497689312.

The previous prime is 1211222110067. The next prime is 1211222110201. The reversal of 1211222110111 is 1110112221121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1211222110111 - 2¹⁵ = 1211222077343 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 (1211222110811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1606394995 + ... + 1606395748.

It is an arithmetic number, because the mean of its divisors is an integer number (168671514060).

Almost surely, 2^{1211222110111} is an apocalyptic number.

1211222110111 is a deficient number, since it is larger than the sum of its proper divisors (138150002369).

1211222110111 is a wasteful number, since it uses less digits than its factorization.

1211222110111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3212790785.

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

Adding to 1211222110111 its reverse (1110112221121), we get a palindrome (2321334331232).

The spelling of 1211222110111 in words is "one trillion, two hundred eleven billion, two hundred twenty-two million, one hundred ten thousand, one hundred eleven".