121111100012101 has 4 divisors (see below), whose sum is σ = 128235282365772. Its totient is φ = 113986917658432.

The previous prime is 121111100012099. The next prime is 121111100012107. The reversal of 121111100012101 is 101210001111121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 70872405030625 + 50238694981476 = 8418575^2 + 7087926^2 .

It is a cyclic number.

It is not a de Polignac number, because 121111100012101 - 2¹ = 121111100012099 is a prime.

It is a super-2 number, since 2×121111100012101² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121111100012107) 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 3 ways as a sum of consecutive naturals, for example, 3562091176810 + ... + 3562091176843.

It is an arithmetic number, because the mean of its divisors is an integer number (32058820591443).

Almost surely, 2^{121111100012101} is an apocalyptic number.

It is an amenable number.

121111100012101 is a deficient number, since it is larger than the sum of its proper divisors (7124182353671).

121111100012101 is an equidigital number, since it uses as much as digits as its factorization.

121111100012101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7124182353670.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 121111100012101 its reverse (101210001111121), we get a palindrome (222321101123222).

The spelling of 121111100012101 in words is "one hundred twenty-one trillion, one hundred eleven billion, one hundred million, twelve thousand, one hundred one".