121120211021221 has 4 divisors (see below), whose sum is σ = 121120487456512. Its totient is φ = 121119934585932.

The previous prime is 121120211021219. The next prime is 121120211021233. The reversal of 121120211021221 is 122120112021121.

It is a happy number.

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 121120211021221 - 2¹ = 121120211021219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121124211021221) 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, 137559375 + ... + 138437068.

It is an arithmetic number, because the mean of its divisors is an integer number (30280121864128).

Almost surely, 2^{121120211021221} is an apocalyptic number.

It is an amenable number.

121120211021221 is a deficient number, since it is larger than the sum of its proper divisors (276435291).

121120211021221 is an equidigital number, since it uses as much as digits as its factorization.

121120211021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276435290.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 121120211021221 its reverse (122120112021121), we get a palindrome (243240323042342).

The spelling of 121120211021221 in words is "one hundred twenty-one trillion, one hundred twenty billion, two hundred eleven million, twenty-one thousand, two hundred twenty-one".