121221001012111 has 48 divisors (see below), whose sum is σ = 171377239652640. Its totient is φ = 84185310424320.

The previous prime is 121221001012061. The next prime is 121221001012183. The reversal of 121221001012111 is 111210100122121.

It is not a de Polignac number, because 121221001012111 - 2²¹ = 121220998914959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221001010111) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 298072416 + ... + 298478821.

It is an arithmetic number, because the mean of its divisors is an integer number (3570359159430).

Almost surely, 2^{121221001012111} is an apocalyptic number.

121221001012111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121221001012111 is a deficient number, since it is larger than the sum of its proper divisors (50156238640529).

121221001012111 is a wasteful number, since it uses less digits than its factorization.

121221001012111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 596551304 (or 596551297 counting only the distinct ones).

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

Adding to 121221001012111 its reverse (111210100122121), we get a palindrome (232431101134232).

It can be divided in two parts, 1212210010 and 12111, that added together give a palindrome (1212222121).

The spelling of 121221001012111 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, one million, twelve thousand, one hundred eleven".