1220121210111 has 16 divisors (see below), whose sum is σ = 1663641793920. Its totient is φ = 795170999520.

The previous prime is 1220121210101. The next prime is 1220121210137. The reversal of 1220121210111 is 1110121210221.

It is a happy number.

It is not a de Polignac number, because 1220121210111 - 2¹¹ = 1220121208063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220121210101) 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, 20422101 + ... + 20481758.

It is an arithmetic number, because the mean of its divisors is an integer number (103977612120).

Almost surely, 2^{1220121210111} is an apocalyptic number.

1220121210111 is a deficient number, since it is larger than the sum of its proper divisors (443520583809).

1220121210111 is a wasteful number, since it uses less digits than its factorization.

1220121210111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40904086.

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

Adding to 1220121210111 its reverse (1110121210221), we get a palindrome (2330242420332).

The spelling of 1220121210111 in words is "one trillion, two hundred twenty billion, one hundred twenty-one million, two hundred ten thousand, one hundred eleven".