121420201111 has 16 divisors (see below), whose sum is σ = 136745745408. Its totient is φ = 106809969600.

The previous prime is 121420201099. The next prime is 121420201127. The reversal of 121420201111 is 111102024121.

It is a cyclic number.

It is not a de Polignac number, because 121420201111 - 2²⁹ = 120883330199 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 (121420201211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6398940 + ... + 6417886.

It is an arithmetic number, because the mean of its divisors is an integer number (8546609088).

Almost surely, 2^121420201111 is an apocalyptic number.

121420201111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121420201111 is a deficient number, since it is larger than the sum of its proper divisors (15325544297).

121420201111 is a wasteful number, since it uses less digits than its factorization.

121420201111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37782.

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

Adding to 121420201111 its reverse (111102024121), we get a palindrome (232522225232).

The spelling of 121420201111 in words is "one hundred twenty-one billion, four hundred twenty million, two hundred one thousand, one hundred eleven".