121220000001 has 6 divisors (see below), whose sum is σ = 175095555570. Its totient is φ = 80813333328.

The previous prime is 121219999997. The next prime is 121220000051. The reversal of 121220000001 is 100000022121.

It can be written as a sum of positive squares in only one way, i.e., 65323692225 + 55896307776 = 255585^2 + 236424^2 .

It is not a de Polignac number, because 121220000001 - 2² = 121219999997 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 13468888889 = 121220000001 / (1 + 2 + 1 + 2 + 2 + 0 + 0 + 0 + 0 + 0 + 0 + 1).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (121220000051) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6734444436 + ... + 6734444453.

It is an arithmetic number, because the mean of its divisors is an integer number (29182592595).

Almost surely, 2^121220000001 is an apocalyptic number.

It is an amenable number.

121220000001 is a deficient number, since it is larger than the sum of its proper divisors (53875555569).

121220000001 is a wasteful number, since it uses less digits than its factorization.

121220000001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13468888895 (or 13468888892 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 121220000001 its reverse (100000022121), we get a palindrome (221220022122).

The spelling of 121220000001 in words is "one hundred twenty-one billion, two hundred twenty million, one", and thus it is an aban number.