121220001209 has 2 divisors, whose sum is σ = 121220001210. Its totient is φ = 121220001208.

The previous prime is 121220001181. The next prime is 121220001211. The reversal of 121220001209 is 902100022121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120133639609 + 1086361600 = 346603^2 + 32960^2 .

It is a cyclic number.

It is not a de Polignac number, because 121220001209 - 2⁸ = 121220000953 is a prime.

It is a super-2 number, since 2×121220001209² (a number of 23 digits) contains 22 as substring.

Together with 121220001211, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121220001229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610000604 + 60610000605.

It is an arithmetic number, because the mean of its divisors is an integer number (60610000605).

Almost surely, 2^121220001209 is an apocalyptic number.

It is an amenable number.

121220001209 is a deficient number, since it is larger than the sum of its proper divisors (1).

121220001209 is an equidigital number, since it uses as much as digits as its factorization.

121220001209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 20.

The spelling of 121220001209 in words is "one hundred twenty-one billion, two hundred twenty million, one thousand, two hundred nine".