2121221011999 has 4 divisors (see below), whose sum is σ = 2121224250600. Its totient is φ = 2121217773400.

The previous prime is 2121221011969. The next prime is 2121221012023. The reversal of 2121221011999 is 9991101221212.

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

It is a cyclic number.

It is not a de Polignac number, because 2121221011999 - 2¹¹ = 2121221009951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121221011939) 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, 251977 + ... + 2075074.

It is an arithmetic number, because the mean of its divisors is an integer number (530306062650).

Almost surely, 2^{2121221011999} is an apocalyptic number.

2121221011999 is a deficient number, since it is larger than the sum of its proper divisors (3238601).

2121221011999 is an equidigital number, since it uses as much as digits as its factorization.

2121221011999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3238600.

The product of its (nonzero) digits is 11664, while the sum is 40.

The spelling of 2121221011999 in words is "two trillion, one hundred twenty-one billion, two hundred twenty-one million, eleven thousand, nine hundred ninety-nine".