121211220001 has 4 divisors (see below), whose sum is σ = 121316347972. Its totient is φ = 121106092032.

The previous prime is 121211219993. The next prime is 121211220007. The reversal of 121211220001 is 100022112121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 100457936401 + 20753283600 = 316951^2 + 144060^2 .

It is a cyclic number.

It is not a de Polignac number, because 121211220001 - 2³ = 121211219993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121211220007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52562256 + ... + 52564561.

It is an arithmetic number, because the mean of its divisors is an integer number (30329086993).

Almost surely, 2^121211220001 is an apocalyptic number.

It is an amenable number.

121211220001 is a deficient number, since it is larger than the sum of its proper divisors (105127971).

121211220001 is a wasteful number, since it uses less digits than its factorization.

121211220001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105127970.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 121211220001 its reverse (100022112121), we get a palindrome (221233332122).

The spelling of 121211220001 in words is "one hundred twenty-one billion, two hundred eleven million, two hundred twenty thousand, one".