1212222120111 has 48 divisors (see below), whose sum is σ = 1829439131520. Its totient is φ = 772705241280.

The previous prime is 1212222120103. The next prime is 1212222120119. The reversal of 1212222120111 is 1110212222121.

1212222120111 is a `hidden beast` number, since 1 + 212 + 222 + 120 + 111 = 666.

It is an interprime number because it is at equal distance from previous prime (1212222120103) and next prime (1212222120119).

It is not a de Polignac number, because 1212222120111 - 2³ = 1212222120103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212222120119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 65434896 + ... + 65453418.

It is an arithmetic number, because the mean of its divisors is an integer number (38113315240).

Almost surely, 2^{1212222120111} is an apocalyptic number.

1212222120111 is a deficient number, since it is larger than the sum of its proper divisors (617217011409).

1212222120111 is a wasteful number, since it uses less digits than its factorization.

1212222120111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21956 (or 21953 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1212222120111 its reverse (1110212222121), we get a palindrome (2322434342232).

The spelling of 1212222120111 in words is "one trillion, two hundred twelve billion, two hundred twenty-two million, one hundred twenty thousand, one hundred eleven".