121221202151201 has 2 divisors, whose sum is σ = 121221202151202. Its totient is φ = 121221202151200.

The previous prime is 121221202151141. The next prime is 121221202151209. The reversal of 121221202151201 is 102151202122121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 102414885760576 + 18806316390625 = 10120024^2 + 4336625^2 .

It is a cyclic number.

It is not a de Polignac number, because 121221202151201 - 2³⁴ = 121204022282017 is a prime.

It is not a weakly prime, because it can be changed into another prime (121221202151209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610601075600 + 60610601075601.

It is an arithmetic number, because the mean of its divisors is an integer number (60610601075601).

Almost surely, 2^{121221202151201} is an apocalyptic number.

It is an amenable number.

121221202151201 is a deficient number, since it is larger than the sum of its proper divisors (1).

121221202151201 is an equidigital number, since it uses as much as digits as its factorization.

121221202151201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 320, while the sum is 23.

Adding to 121221202151201 its reverse (102151202122121), we get a palindrome (223372404273322).

The spelling of 121221202151201 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, two hundred two million, one hundred fifty-one thousand, two hundred one".