121221022111 has 16 divisors (see below), whose sum is σ = 138982875904. Its totient is φ = 103570830144.

The previous prime is 121221022049. The next prime is 121221022127. The reversal of 121221022111 is 111220122121.

It is a cyclic number.

It is not a de Polignac number, because 121221022111 - 2⁷ = 121221021983 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 (121221082111) 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, 2860171 + ... + 2902243.

It is an arithmetic number, because the mean of its divisors is an integer number (8686429744).

Almost surely, 2^121221022111 is an apocalyptic number.

121221022111 is a deficient number, since it is larger than the sum of its proper divisors (17761853793).

121221022111 is an equidigital number, since it uses as much as digits as its factorization.

121221022111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43390.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 121221022111 its reverse (111220122121), we get a palindrome (232441144232).

It can be divided in two parts, 1212210 and 22111, that added together give a palindrome (1234321).

The spelling of 121221022111 in words is "one hundred twenty-one billion, two hundred twenty-one million, twenty-two thousand, one hundred eleven".