2221220112221 has 4 divisors (see below), whose sum is σ = 2423149213344. Its totient is φ = 2019291011100.

The previous prime is 2221220112191. The next prime is 2221220112233. The reversal of 2221220112221 is 1222110221222.

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 not a de Polignac number, because 2221220112221 - 2³⁸ = 1946342205277 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2221220112193 and 2221220112202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221720112221) 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, 100964550545 + ... + 100964550566.

It is an arithmetic number, because the mean of its divisors is an integer number (605787303336).

Almost surely, 2^{2221220112221} is an apocalyptic number.

It is an amenable number.

2221220112221 is a deficient number, since it is larger than the sum of its proper divisors (201929101123).

2221220112221 is a wasteful number, since it uses less digits than its factorization.

2221220112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201929101122.

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

Adding to 2221220112221 its reverse (1222110221222), we get a palindrome (3443330333443).

The spelling of 2221220112221 in words is "two trillion, two hundred twenty-one billion, two hundred twenty million, one hundred twelve thousand, two hundred twenty-one".