121201210100001 has 16 divisors (see below), whose sum is σ = 161840545483968. Its totient is φ = 80681352696000.

The previous prime is 121201210099987. The next prime is 121201210100063. The reversal of 121201210100001 is 100001012102121.

It is not a de Polignac number, because 121201210100001 - 2¹⁰ = 121201210098977 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121201210100001.

It is not an unprimeable number, because it can be changed into a prime (121201210100501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39284491 + ... + 42257231.

It is an arithmetic number, because the mean of its divisors is an integer number (10115034092748).

Almost surely, 2^{121201210100001} is an apocalyptic number.

It is an amenable number.

121201210100001 is a deficient number, since it is larger than the sum of its proper divisors (40639335383967).

121201210100001 is a wasteful number, since it uses less digits than its factorization.

121201210100001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2992832.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 121201210100001 its reverse (100001012102121), we get a palindrome (221202222202122).

The spelling of 121201210100001 in words is "one hundred twenty-one trillion, two hundred one billion, two hundred ten million, one hundred thousand, one".