1220121112111 has 4 divisors (see below), whose sum is σ = 1331041213224.
Its totient is φ = 1109201011000.
The previous prime is 1220121112109. The next prime is 1220121112121. The reversal of 1220121112111 is 1112111210221.
Adding to 1220121112111 its reverse (1112111210221), we get a palindrome (2332232322332).
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 1220121112111 - 21 = 1220121112109 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 (1220121112121) 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, 55460050540 + ... + 55460050561.
It is an arithmetic number, because the mean of its divisors is an integer number (332760303306).
Almost surely, 21220121112111 is an apocalyptic number.
1220121112111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.
1220121112111 is a deficient number, since it is larger than the sum of its proper divisors (110920101113).
1220121112111 is a wasteful number, since it uses less digits than its factorization.
1220121112111 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 110920101112.
The product of its (nonzero) digits is 16, while the sum is 16.
The spelling of 1220121112111 in words is "one trillion, two hundred twenty billion, one hundred twenty-one million, one hundred twelve thousand, one hundred eleven".