121212100001 has 4 divisors (see below), whose sum is σ = 122672486832. Its totient is φ = 119751713172.

The previous prime is 121212099979. The next prime is 121212100013. The reversal of 121212100001 is 100001212121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 121212100001 - 2¹⁰ = 121212098977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121212100201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 730193291 + ... + 730193456.

It is an arithmetic number, because the mean of its divisors is an integer number (30668121708).

Almost surely, 2^121212100001 is an apocalyptic number.

It is an amenable number.

121212100001 is a deficient number, since it is larger than the sum of its proper divisors (1460386831).

121212100001 is an equidigital number, since it uses as much as digits as its factorization.

121212100001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1460386830.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 121212100001 its reverse (100001212121), we get a palindrome (221213312122).

The spelling of 121212100001 in words is "one hundred twenty-one billion, two hundred twelve million, one hundred thousand, one".