121022717861 has 2 divisors, whose sum is σ = 121022717862. Its totient is φ = 121022717860.

The previous prime is 121022717819. The next prime is 121022717863. The reversal of 121022717861 is 168717220121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 114645896836 + 6376821025 = 338594^2 + 79855^2 .

It is a cyclic number.

It is not a de Polignac number, because 121022717861 - 2¹⁴ = 121022701477 is a prime.

Together with 121022717863, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121022717863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60511358930 + 60511358931.

It is an arithmetic number, because the mean of its divisors is an integer number (60511358931).

Almost surely, 2^121022717861 is an apocalyptic number.

It is an amenable number.

121022717861 is a deficient number, since it is larger than the sum of its proper divisors (1).

121022717861 is an equidigital number, since it uses as much as digits as its factorization.

121022717861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18816, while the sum is 38.

Adding to 121022717861 its reverse (168717220121), we get a palindrome (289739937982).

The spelling of 121022717861 in words is "one hundred twenty-one billion, twenty-two million, seven hundred seventeen thousand, eight hundred sixty-one".