1212120021111 has 16 divisors (see below), whose sum is σ = 1624849489920. Its totient is φ = 803736470880.

The previous prime is 1212120021097. The next prime is 1212120021113. The reversal of 1212120021111 is 1111200212121.

It is a happy number.

It is not a de Polignac number, because 1212120021111 - 2³⁸ = 937242114167 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212120021113) 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, 4043346 + ... + 4332768.

It is an arithmetic number, because the mean of its divisors is an integer number (101553093120).

Almost surely, 2^{1212120021111} is an apocalyptic number.

1212120021111 is a deficient number, since it is larger than the sum of its proper divisors (412729468809).

1212120021111 is a wasteful number, since it uses less digits than its factorization.

1212120021111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296926.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1212120021111 its reverse (1111200212121), we get a palindrome (2323320233232).

The spelling of 1212120021111 in words is "one trillion, two hundred twelve billion, one hundred twenty million, twenty-one thousand, one hundred eleven".