121220410111 has 4 divisors (see below), whose sum is σ = 121992514792. Its totient is φ = 120448305432.

The previous prime is 121220410081. The next prime is 121220410117. The reversal of 121220410111 is 111014022121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 111014022121 = 223 ⋅497820727.

It is a cyclic number.

It is not a de Polignac number, because 121220410111 - 2¹³ = 121220401919 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 (121220410117) 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, 386052105 + ... + 386052418.

It is an arithmetic number, because the mean of its divisors is an integer number (30498128698).

Almost surely, 2^121220410111 is an apocalyptic number.

121220410111 is a deficient number, since it is larger than the sum of its proper divisors (772104681).

121220410111 is an equidigital number, since it uses as much as digits as its factorization.

121220410111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 772104680.

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

Adding to 121220410111 its reverse (111014022121), we get a palindrome (232234432232).

The spelling of 121220410111 in words is "one hundred twenty-one billion, two hundred twenty million, four hundred ten thousand, one hundred eleven".