1211022202111 has 4 divisors (see below), whose sum is σ = 1211032465000. Its totient is φ = 1211011939224.

The previous prime is 1211022202099. The next prime is 1211022202211. The reversal of 1211022202111 is 1112022201121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1211022202111 - 2³¹ = 1208874718463 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 (1211022202211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4952361 + ... + 5191138.

It is an arithmetic number, because the mean of its divisors is an integer number (302758116250).

Almost surely, 2^{1211022202111} is an apocalyptic number.

1211022202111 is a deficient number, since it is larger than the sum of its proper divisors (10262889).

1211022202111 is a wasteful number, since it uses less digits than its factorization.

1211022202111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10262888.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1211022202111 its reverse (1112022201121), we get a palindrome (2323044403232).

The spelling of 1211022202111 in words is "one trillion, two hundred eleven billion, twenty-two million, two hundred two thousand, one hundred eleven".