2120121011221 has 2 divisors, whose sum is σ = 2120121011222. Its totient is φ = 2120121011220.

The previous prime is 2120121011219. The next prime is 2120121011263. The reversal of 2120121011221 is 1221101210212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2026950164100 + 93170847121 = 1423710^2 + 305239^2 .

It is a cyclic number.

It is not a de Polignac number, because 2120121011221 - 2¹ = 2120121011219 is a prime.

Together with 2120121011219, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 2120121011195 and 2120121011204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2120121011321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060060505610 + 1060060505611.

It is an arithmetic number, because the mean of its divisors is an integer number (1060060505611).

Almost surely, 2^{2120121011221} is an apocalyptic number.

It is an amenable number.

2120121011221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2120121011221 is an equidigital number, since it uses as much as digits as its factorization.

2120121011221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 2120121011221 its reverse (1221101210212), we get a palindrome (3341222221433).

The spelling of 2120121011221 in words is "two trillion, one hundred twenty billion, one hundred twenty-one million, eleven thousand, two hundred twenty-one".