2111221321221 has 4 divisors (see below), whose sum is σ = 2814961761632. Its totient is φ = 1407480880812.

The previous prime is 2111221321169. The next prime is 2111221321273. The reversal of 2111221321221 is 1221231221112.

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 an interprime number because it is at equal distance from previous prime (2111221321169) and next prime (2111221321273).

It is not a de Polignac number, because 2111221321221 - 2⁹ = 2111221320709 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 (2111221321021) 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, 351870220201 + ... + 351870220206.

It is an arithmetic number, because the mean of its divisors is an integer number (703740440408).

Almost surely, 2^{2111221321221} is an apocalyptic number.

It is an amenable number.

2111221321221 is a deficient number, since it is larger than the sum of its proper divisors (703740440411).

2111221321221 is an equidigital number, since it uses as much as digits as its factorization.

2111221321221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 703740440410.

The product of its digits is 192, while the sum is 21.

Adding to 2111221321221 its reverse (1221231221112), we get a palindrome (3332452542333).

The spelling of 2111221321221 in words is "two trillion, one hundred eleven billion, two hundred twenty-one million, three hundred twenty-one thousand, two hundred twenty-one".