121991622611 has 2 divisors, whose sum is σ = 121991622612. Its totient is φ = 121991622610.

The previous prime is 121991622601. The next prime is 121991622667. The reversal of 121991622611 is 116226199121.

It is a weak prime.

It is an emirp because it is prime and its reverse (116226199121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121991622611 - 2²² = 121987428307 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (121991622601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60995811305 + 60995811306.

It is an arithmetic number, because the mean of its divisors is an integer number (60995811306).

Almost surely, 2^121991622611 is an apocalyptic number.

121991622611 is a deficient number, since it is larger than the sum of its proper divisors (1).

121991622611 is an equidigital number, since it uses as much as digits as its factorization.

121991622611 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 41.

The spelling of 121991622611 in words is "one hundred twenty-one billion, nine hundred ninety-one million, six hundred twenty-two thousand, six hundred eleven".