121020020121111 has 16 divisors (see below), whose sum is σ = 162624896569344. Its totient is φ = 80048209408704.

The previous prime is 121020020121097. The next prime is 121020020121113. The reversal of 121020020121111 is 111121020020121.

It is a happy number.

It is not a de Polignac number, because 121020020121111 - 2⁹ = 121020020120599 is a prime.

It is a super-2 number, since 2×121020020121111² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121020020121113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78089815 + ... + 79624488.

It is an arithmetic number, because the mean of its divisors is an integer number (10164056035584).

Almost surely, 2^{121020020121111} is an apocalyptic number.

121020020121111 is a deficient number, since it is larger than the sum of its proper divisors (41604876448233).

121020020121111 is a wasteful number, since it uses less digits than its factorization.

121020020121111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157716310.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 121020020121111 its reverse (111121020020121), we get a palindrome (232141040141232).

It can be divided in two parts, 121020020121 and 111, that multiplied together give a palindrome (13433222233431).

The spelling of 121020020121111 in words is "one hundred twenty-one trillion, twenty billion, twenty million, one hundred twenty-one thousand, one hundred eleven".