2211220891321 has 4 divisors (see below), whose sum is σ = 2381314806052. Its totient is φ = 2041126976592.

The previous prime is 2211220891307. The next prime is 2211220891331. The reversal of 2211220891321 is 1231980221122.

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 119740913296 + 2091479978025 = 346036^2 + 1446195^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2211220891321 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2211220891331) 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, 85046957346 + ... + 85046957371.

It is an arithmetic number, because the mean of its divisors is an integer number (595328701513).

Almost surely, 2^{2211220891321} is an apocalyptic number.

It is an amenable number.

2211220891321 is a deficient number, since it is larger than the sum of its proper divisors (170093914731).

2211220891321 is a wasteful number, since it uses less digits than its factorization.

2211220891321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170093914730.

The product of its (nonzero) digits is 6912, while the sum is 34.

The spelling of 2211220891321 in words is "two trillion, two hundred eleven billion, two hundred twenty million, eight hundred ninety-one thousand, three hundred twenty-one".