121020210120221 has 4 divisors (see below), whose sum is σ = 121021588523232. Its totient is φ = 121018831717212.

The previous prime is 121020210120179. The next prime is 121020210120253. The reversal of 121020210120221 is 122021012020121.

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 121020210120221 - 2¹⁰ = 121020210119197 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121020210120221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121020210120421) 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, 689069801 + ... + 689245406.

It is an arithmetic number, because the mean of its divisors is an integer number (30255397130808).

Almost surely, 2^{121020210120221} is an apocalyptic number.

It is an amenable number.

121020210120221 is a deficient number, since it is larger than the sum of its proper divisors (1378403011).

121020210120221 is an equidigital number, since it uses as much as digits as its factorization.

121020210120221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1378403010.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 121020210120221 its reverse (122021012020121), we get a palindrome (243041222140342).

The spelling of 121020210120221 in words is "one hundred twenty-one trillion, twenty billion, two hundred ten million, one hundred twenty thousand, two hundred twenty-one".