20211120121 has 2 divisors, whose sum is σ = 20211120122. Its totient is φ = 20211120120.

The previous prime is 20211120113. The next prime is 20211120143. The reversal of 20211120121 is 12102111202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20186726400 + 24393721 = 142080^2 + 4939^2 .

It is a cyclic number.

It is not a de Polignac number, because 20211120121 - 2³ = 20211120113 is a prime.

It is not a weakly prime, because it can be changed into another prime (20211120221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105560060 + 10105560061.

It is an arithmetic number, because the mean of its divisors is an integer number (10105560061).

Almost surely, 2^20211120121 is an apocalyptic number.

It is an amenable number.

20211120121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20211120121 is an equidigital number, since it uses as much as digits as its factorization.

20211120121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20211120121 its reverse (12102111202), we get a palindrome (32313231323).

The spelling of 20211120121 in words is "twenty billion, two hundred eleven million, one hundred twenty thousand, one hundred twenty-one".