121112201120021 has 4 divisors (see below), whose sum is σ = 121268879259372. Its totient is φ = 120955522980672.

The previous prime is 121112201119997. The next prime is 121112201120083. The reversal of 121112201120021 is 120021102211121.

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 38029249569796 + 83082951550225 = 6166786^2 + 9114985^2 .

It is a cyclic number.

It is not a de Polignac number, because 121112201120021 - 2¹⁸ = 121112200857877 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121112201620021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78339068516 + ... + 78339070061.

It is an arithmetic number, because the mean of its divisors is an integer number (30317219814843).

Almost surely, 2^{121112201120021} is an apocalyptic number.

It is an amenable number.

121112201120021 is a deficient number, since it is larger than the sum of its proper divisors (156678139351).

121112201120021 is an equidigital number, since it uses as much as digits as its factorization.

121112201120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156678139350.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 121112201120021 its reverse (120021102211121), we get a palindrome (241133303331142).

The spelling of 121112201120021 in words is "one hundred twenty-one trillion, one hundred twelve billion, two hundred one million, one hundred twenty thousand, twenty-one".