121012012200021 has 4 divisors (see below), whose sum is σ = 161349349600032. Its totient is φ = 80674674800012.

The previous prime is 121012012199999. The next prime is 121012012200041. The reversal of 121012012200021 is 120002210210121.

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 121012012200021 - 2¹⁵ = 121012012167253 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121012012200041) 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, 20168668700001 + ... + 20168668700006.

It is an arithmetic number, because the mean of its divisors is an integer number (40337337400008).

Almost surely, 2^{121012012200021} is an apocalyptic number.

It is an amenable number.

121012012200021 is a deficient number, since it is larger than the sum of its proper divisors (40337337400011).

121012012200021 is an equidigital number, since it uses as much as digits as its factorization.

121012012200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40337337400010.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 121012012200021 its reverse (120002210210121), we get a palindrome (241014222410142).

The spelling of 121012012200021 in words is "one hundred twenty-one trillion, twelve billion, twelve million, two hundred thousand, twenty-one".