121222211221111 has 128 divisors (see below), whose sum is σ = 170954493050880. Its totient is φ = 82854549043200.

The previous prime is 121222211221109. The next prime is 121222211221201. The reversal of 121222211221111 is 111122112222121.

It is not a de Polignac number, because 121222211221111 - 2¹ = 121222211221109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121222211221411) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 2156605375 + ... + 2156661583.

It is an arithmetic number, because the mean of its divisors is an integer number (1335581976960).

Almost surely, 2^{121222211221111} is an apocalyptic number.

121222211221111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121222211221111 is a deficient number, since it is larger than the sum of its proper divisors (49732281829769).

121222211221111 is a wasteful number, since it uses less digits than its factorization.

121222211221111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56877.

The product of its digits is 128, while the sum is 22.

Adding to 121222211221111 its reverse (111122112222121), we get a palindrome (232344323443232).

The spelling of 121222211221111 in words is "one hundred twenty-one trillion, two hundred twenty-two billion, two hundred eleven million, two hundred twenty-one thousand, one hundred eleven".