121211100001 has 16 divisors (see below), whose sum is σ = 128900174400. Its totient is φ = 113653800000.

The previous prime is 121211099983. The next prime is 121211100029. The reversal of 121211100001 is 100001112121.

It is a cyclic number.

It is not a de Polignac number, because 121211100001 - 2²⁵ = 121177545569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121211100061) 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, 6228955 + ... + 6248383.

It is an arithmetic number, because the mean of its divisors is an integer number (8056260900).

Almost surely, 2^121211100001 is an apocalyptic number.

It is an amenable number.

121211100001 is a deficient number, since it is larger than the sum of its proper divisors (7689074399).

121211100001 is a wasteful number, since it uses less digits than its factorization.

121211100001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22800.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 121211100001 its reverse (100001112121), we get a palindrome (221212212122).

The spelling of 121211100001 in words is "one hundred twenty-one billion, two hundred eleven million, one hundred thousand, one".