2221102212221 has 4 divisors (see below), whose sum is σ = 2224690423200. Its totient is φ = 2217514001244.

The previous prime is 2221102212209. The next prime is 2221102212233. The reversal of 2221102212221 is 1222122011222.

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 (2221102212209) and next prime (2221102212233).

It is a cyclic number.

It is not a de Polignac number, because 2221102212221 - 2¹⁰ = 2221102211197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2221102212193 and 2221102212202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221102215221) 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, 1794104561 + ... + 1794105798.

It is an arithmetic number, because the mean of its divisors is an integer number (556172605800).

Almost surely, 2^{2221102212221} is an apocalyptic number.

It is an amenable number.

2221102212221 is a deficient number, since it is larger than the sum of its proper divisors (3588210979).

2221102212221 is an equidigital number, since it uses as much as digits as its factorization.

2221102212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3588210978.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 2221102212221 its reverse (1222122011222), we get a palindrome (3443224223443).

The spelling of 2221102212221 in words is "two trillion, two hundred twenty-one billion, one hundred two million, two hundred twelve thousand, two hundred twenty-one".