121101220109 has 2 divisors, whose sum is σ = 121101220110. Its totient is φ = 121101220108.

The previous prime is 121101220073. The next prime is 121101220117. The reversal of 121101220109 is 901022101121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112929602500 + 8171617609 = 336050^2 + 90397^2 .

It is a cyclic number.

It is not a de Polignac number, because 121101220109 - 2¹² = 121101216013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121101220129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60550610054 + 60550610055.

It is an arithmetic number, because the mean of its divisors is an integer number (60550610055).

Almost surely, 2^121101220109 is an apocalyptic number.

It is an amenable number.

121101220109 is a deficient number, since it is larger than the sum of its proper divisors (1).

121101220109 is an equidigital number, since it uses as much as digits as its factorization.

121101220109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 20.

The spelling of 121101220109 in words is "one hundred twenty-one billion, one hundred one million, two hundred twenty thousand, one hundred nine".