2221120220021 has 4 divisors (see below), whose sum is σ = 2227830553344. Its totient is φ = 2214409886700.

The previous prime is 2221120219999. The next prime is 2221120220117. The reversal of 2221120220021 is 1200220211222.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 2221120220021 - 2¹⁸ = 2221119957877 is a prime.

It is a super-2 number, since 2×2221120220021² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221129220021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3355166165 + ... + 3355166826.

It is an arithmetic number, because the mean of its divisors is an integer number (556957638336).

Almost surely, 2^{2221120220021} is an apocalyptic number.

It is an amenable number.

2221120220021 is a deficient number, since it is larger than the sum of its proper divisors (6710333323).

2221120220021 is an equidigital number, since it uses as much as digits as its factorization.

2221120220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6710333322.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 2221120220021 its reverse (1200220211222), we get a palindrome (3421340431243).

The spelling of 2221120220021 in words is "two trillion, two hundred twenty-one billion, one hundred twenty million, two hundred twenty thousand, twenty-one".