121200109 has 2 divisors, whose sum is σ = 121200110. Its totient is φ = 121200108.

The previous prime is 121200097. The next prime is 121200139. The reversal of 121200109 is 901002121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 88172100 + 33028009 = 9390^2 + 5747^2 .

It is an emirp because it is prime and its reverse (901002121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121200109 - 2⁹ = 121199597 is a prime.

It is a super-2 number, since 2×121200109² = 29378932843223762, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121200092 and 121200101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121200139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60600054 + 60600055.

It is an arithmetic number, because the mean of its divisors is an integer number (60600055).

Almost surely, 2^121200109 is an apocalyptic number.

It is an amenable number.

121200109 is a deficient number, since it is larger than the sum of its proper divisors (1).

121200109 is an equidigital number, since it uses as much as digits as its factorization.

121200109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 121200109 is about 11009.0921060731. The cubic root of 121200109 is about 494.8812543787.

The spelling of 121200109 in words is "one hundred twenty-one million, two hundred thousand, one hundred nine".