2221200011221 has 2 divisors, whose sum is σ = 2221200011222. Its totient is φ = 2221200011220.

The previous prime is 2221200011131. The next prime is 2221200011257. The reversal of 2221200011221 is 1221100021222.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1893513602500 + 327686408721 = 1376050^2 + 572439^2 .

It is a cyclic number.

It is not a de Polignac number, because 2221200011221 - 2¹⁷ = 2221199880149 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2221200011195 and 2221200011204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2221200011291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1110600005610 + 1110600005611.

It is an arithmetic number, because the mean of its divisors is an integer number (1110600005611).

Almost surely, 2^{2221200011221} is an apocalyptic number.

It is an amenable number.

2221200011221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2221200011221 is an equidigital number, since it uses as much as digits as its factorization.

2221200011221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 2221200011221 its reverse (1221100021222), we get a palindrome (3442300032443).

It can be divided in two parts, 222120001 and 1221, that added together give a palindrome (222121222).

The spelling of 2221200011221 in words is "two trillion, two hundred twenty-one billion, two hundred million, eleven thousand, two hundred twenty-one".