2211221321021 has 8 divisors (see below), whose sum is σ = 2365430208120. Its totient is φ = 2059694327808.

The previous prime is 2211221321017. The next prime is 2211221321041. The reversal of 2211221321021 is 1201231221122.

It can be written as a sum of positive squares in 4 ways, for example, as 33029064121 + 2178192256900 = 181739^2 + 1475870^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2211221321021 - 2² = 2211221321017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2211221320984 and 2211221321002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2211221321011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 670471766 + ... + 670475063.

It is an arithmetic number, because the mean of its divisors is an integer number (295678776015).

Almost surely, 2^{2211221321021} is an apocalyptic number.

It is an amenable number.

2211221321021 is a deficient number, since it is larger than the sum of its proper divisors (154208887099).

2211221321021 is a wasteful number, since it uses less digits than its factorization.

2211221321021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1340946943.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 2211221321021 its reverse (1201231221122), we get a palindrome (3412452542143).

The spelling of 2211221321021 in words is "two trillion, two hundred eleven billion, two hundred twenty-one million, three hundred twenty-one thousand, twenty-one".