1212112220001 has 4 divisors (see below), whose sum is σ = 1616149626672. Its totient is φ = 808074813332.

The previous prime is 1212112219999. The next prime is 1212112220063. The reversal of 1212112220001 is 1000222112121.

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 1212112220001 - 2¹ = 1212112219999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1212112220201) 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, 202018703331 + ... + 202018703336.

It is an arithmetic number, because the mean of its divisors is an integer number (404037406668).

Almost surely, 2^{1212112220001} is an apocalyptic number.

It is an amenable number.

1212112220001 is a deficient number, since it is larger than the sum of its proper divisors (404037406671).

1212112220001 is an equidigital number, since it uses as much as digits as its factorization.

1212112220001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404037406670.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1212112220001 its reverse (1000222112121), we get a palindrome (2212334332122).

The spelling of 1212112220001 in words is "one trillion, two hundred twelve billion, one hundred twelve million, two hundred twenty thousand, one".