2121112210001 has 4 divisors (see below), whose sum is σ = 2124572426292. Its totient is φ = 2117651993712.

The previous prime is 2121112209991. The next prime is 2121112210051. The reversal of 2121112210001 is 1000122111212.

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 50434379776 + 2070677830225 = 224576^2 + 1438985^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121112210001 - 2³⁸ = 1846234303057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121112210051) 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, 1730107226 + ... + 1730108451.

It is an arithmetic number, because the mean of its divisors is an integer number (531143106573).

Almost surely, 2^{2121112210001} is an apocalyptic number.

It is an amenable number.

2121112210001 is a deficient number, since it is larger than the sum of its proper divisors (3460216291).

2121112210001 is an equidigital number, since it uses as much as digits as its factorization.

2121112210001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3460216290.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 2121112210001 its reverse (1000122111212), we get a palindrome (3121234321213).

The spelling of 2121112210001 in words is "two trillion, one hundred twenty-one billion, one hundred twelve million, two hundred ten thousand, one".