2121121320011 has 4 divisors (see below), whose sum is σ = 2128948336224. Its totient is φ = 2113294303800.

The previous prime is 2121121319897. The next prime is 2121121320023. The reversal of 2121121320011 is 1100231211212.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121121320011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121121320041) 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, 3913507700 + ... + 3913508241.

It is an arithmetic number, because the mean of its divisors is an integer number (532237084056).

Almost surely, 2^{2121121320011} is an apocalyptic number.

2121121320011 is a deficient number, since it is larger than the sum of its proper divisors (7827016213).

2121121320011 is an equidigital number, since it uses as much as digits as its factorization.

2121121320011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7827016212.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 2121121320011 its reverse (1100231211212), we get a palindrome (3221352531223).

The spelling of 2121121320011 in words is "two trillion, one hundred twenty-one billion, one hundred twenty-one million, three hundred twenty thousand, eleven".