2120121300221 has 4 divisors (see below), whose sum is σ = 2120124343200. Its totient is φ = 2120118257244.

The previous prime is 2120121300217. The next prime is 2120121300233. The reversal of 2120121300221 is 1220031210212.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2120121300221 - 2² = 2120121300217 is a prime.

It is a super-2 number, since 2×2120121300221² (a number of 25 digits) contains 22 as substring.

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 2120121300221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120121300281) 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, 98690 + ... + 2061548.

It is an arithmetic number, because the mean of its divisors is an integer number (530031085800).

Almost surely, 2^{2120121300221} is an apocalyptic number.

It is an amenable number.

2120121300221 is a deficient number, since it is larger than the sum of its proper divisors (3042979).

2120121300221 is a wasteful number, since it uses less digits than its factorization.

2120121300221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3042978.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 2120121300221 its reverse (1220031210212), we get a palindrome (3340152510433).

Subtracting from 2120121300221 its reverse (1220031210212), we obtain a palindrome (900090090009).

The spelling of 2120121300221 in words is "two trillion, one hundred twenty billion, one hundred twenty-one million, three hundred thousand, two hundred twenty-one".