121201020111 has 4 divisors (see below), whose sum is σ = 161601360152. Its totient is φ = 80800680072.

The previous prime is 121201020103. The next prime is 121201020113. The reversal of 121201020111 is 111020102121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 111020102121 = 3 ⋅37006700707.

It is not a de Polignac number, because 121201020111 - 2³ = 121201020103 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 (121201020113) 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, 20200170016 + ... + 20200170021.

It is an arithmetic number, because the mean of its divisors is an integer number (40400340038).

Almost surely, 2^121201020111 is an apocalyptic number.

121201020111 is a deficient number, since it is larger than the sum of its proper divisors (40400340041).

121201020111 is an equidigital number, since it uses as much as digits as its factorization.

121201020111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40400340040.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 121201020111 its reverse (111020102121), we get a palindrome (232221122232).

The spelling of 121201020111 in words is "one hundred twenty-one billion, two hundred one million, twenty thousand, one hundred eleven".