121221031321111 has 4 divisors (see below), whose sum is σ = 126491510943792. Its totient is φ = 115950551698432.

The previous prime is 121221031321109. The next prime is 121221031321151. The reversal of 121221031321111 is 111123130122121.

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 121221031321111 - 2¹ = 121221031321109 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 (121221031321151) 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, 2635239811306 + ... + 2635239811351.

It is an arithmetic number, because the mean of its divisors is an integer number (31622877735948).

Almost surely, 2^{121221031321111} is an apocalyptic number.

121221031321111 is a deficient number, since it is larger than the sum of its proper divisors (5270479622681).

121221031321111 is an equidigital number, since it uses as much as digits as its factorization.

121221031321111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5270479622680.

The product of its (nonzero) digits is 144, while the sum is 22.

Adding to 121221031321111 its reverse (111123130122121), we get a palindrome (232344161443232).

The spelling of 121221031321111 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, thirty-one million, three hundred twenty-one thousand, one hundred eleven".