121205401 has 2 divisors, whose sum is σ = 121205402. Its totient is φ = 121205400.

The previous prime is 121205323. The next prime is 121205429. The reversal of 121205401 is 104502121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115541001 + 5664400 = 10749^2 + 2380^2 .

It is a cyclic number.

It is not a de Polignac number, because 121205401 - 2²³ = 112816793 is a prime.

It is not a weakly prime, because it can be changed into another prime (121209401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60602700 + 60602701.

It is an arithmetic number, because the mean of its divisors is an integer number (60602701).

Almost surely, 2^121205401 is an apocalyptic number.

It is an amenable number.

121205401 is a deficient number, since it is larger than the sum of its proper divisors (1).

121205401 is an equidigital number, since it uses as much as digits as its factorization.

121205401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 121205401 is about 11009.3324502442. The cubic root of 121205401 is about 494.8884569945. Note that the first 3 decimals are identical.

Adding to 121205401 its reverse (104502121), we get a palindrome (225707522).

The spelling of 121205401 in words is "one hundred twenty-one million, two hundred five thousand, four hundred one".