101220120109 has 2 divisors, whose sum is σ = 101220120110. Its totient is φ = 101220120108.

The previous prime is 101220120073. The next prime is 101220120187. The reversal of 101220120109 is 901021022101.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54579238884 + 46640881225 = 233622^2 + 215965^2 .

It is a cyclic number.

It is not a de Polignac number, because 101220120109 - 2¹¹ = 101220118061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101220120709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50610060054 + 50610060055.

It is an arithmetic number, because the mean of its divisors is an integer number (50610060055).

Almost surely, 2^101220120109 is an apocalyptic number.

It is an amenable number.

101220120109 is a deficient number, since it is larger than the sum of its proper divisors (1).

101220120109 is an equidigital number, since it uses as much as digits as its factorization.

101220120109 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 19.

The spelling of 101220120109 in words is "one hundred one billion, two hundred twenty million, one hundred twenty thousand, one hundred nine".