20121120220261 has 2 divisors, whose sum is σ = 20121120220262. Its totient is φ = 20121120220260.

The previous prime is 20121120220213. The next prime is 20121120220307. The reversal of 20121120220261 is 16202202112102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20085016420161 + 36103800100 = 4481631^2 + 190010^2 .

It is a cyclic number.

It is not a de Polignac number, because 20121120220261 - 2²¹ = 20121118123109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20121120220361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060560110130 + 10060560110131.

It is an arithmetic number, because the mean of its divisors is an integer number (10060560110131).

Almost surely, 2^{20121120220261} is an apocalyptic number.

It is an amenable number.

20121120220261 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121120220261 is an equidigital number, since it uses as much as digits as its factorization.

20121120220261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 22.

Adding to 20121120220261 its reverse (16202202112102), we get a palindrome (36323322332363).

The spelling of 20121120220261 in words is "twenty trillion, one hundred twenty-one billion, one hundred twenty million, two hundred twenty thousand, two hundred sixty-one".