2221220221221 has 32 divisors (see below), whose sum is σ = 3301138748160. Its totient is φ = 1321313337344.

The previous prime is 2221220221217. The next prime is 2221220221249. The reversal of 2221220221221 is 1221220221222.

It is a cyclic number.

It is not a de Polignac number, because 2221220221221 - 2² = 2221220221217 is a prime.

It is a super-2 number, since 2×2221220221221² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221220221211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8246316 + ... + 8511413.

It is an arithmetic number, because the mean of its divisors is an integer number (103160585880).

Almost surely, 2^{2221220221221} is an apocalyptic number.

It is an amenable number.

2221220221221 is a deficient number, since it is larger than the sum of its proper divisors (1079918526939).

2221220221221 is a wasteful number, since it uses less digits than its factorization.

2221220221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16757885.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 2221220221221 its reverse (1221220221222), we get a palindrome (3442440442443).

Subtracting from 2221220221221 its reverse (1221220221222), we obtain a palindrome (999999999999).

The spelling of 2221220221221 in words is "two trillion, two hundred twenty-one billion, two hundred twenty million, two hundred twenty-one thousand, two hundred twenty-one".