1212220222111 has 16 divisors (see below), whose sum is σ = 1234798792416. Its totient is φ = 1189841422336.

The previous prime is 1212220222013. The next prime is 1212220222133. The reversal of 1212220222111 is 1112220222121.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1212220222111 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 (1212220222711) 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, 20546991 + ... + 20605903.

It is an arithmetic number, because the mean of its divisors is an integer number (77174924526).

Almost surely, 2^{1212220222111} is an apocalyptic number.

1212220222111 is a deficient number, since it is larger than the sum of its proper divisors (22578570305).

1212220222111 is a wasteful number, since it uses less digits than its factorization.

1212220222111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60602.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 1212220222111 its reverse (1112220222121), we get a palindrome (2324440444232).

The spelling of 1212220222111 in words is "one trillion, two hundred twelve billion, two hundred twenty million, two hundred twenty-two thousand, one hundred eleven".