121102120100021 has 4 divisors (see below), whose sum is σ = 121160822050752. Its totient is φ = 121043418149292.

The previous prime is 121102120099991. The next prime is 121102120100029. The reversal of 121102120100021 is 120001021201121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 121102120100021 - 2¹⁸ = 121102119837877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121102120099969 and 121102120100005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121102120100029) 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, 29350972271 + ... + 29350976396.

It is an arithmetic number, because the mean of its divisors is an integer number (30290205512688).

Almost surely, 2^{121102120100021} is an apocalyptic number.

It is an amenable number.

121102120100021 is a deficient number, since it is larger than the sum of its proper divisors (58701950731).

121102120100021 is an equidigital number, since it uses as much as digits as its factorization.

121102120100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58701950730.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 121102120100021 its reverse (120001021201121), we get a palindrome (241103141301142).

The spelling of 121102120100021 in words is "one hundred twenty-one trillion, one hundred two billion, one hundred twenty million, one hundred thousand, twenty-one".