22221211111021 has 8 divisors (see below), whose sum is σ = 24322838896664. Its totient is φ = 20175626733120.

The previous prime is 22221211111009. The next prime is 22221211111031. The reversal of 22221211111021 is 12011111212222.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1285187262921 + 20936023848100 = 1133661^2 + 4575590^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 22221211111021 - 2¹⁹ = 22221210586733 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22221211111021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22221211111031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14010851106 + ... + 14010852691.

It is an arithmetic number, because the mean of its divisors is an integer number (3040354862083).

Almost surely, 2^{22221211111021} is an apocalyptic number.

It is an amenable number.

22221211111021 is a deficient number, since it is larger than the sum of its proper divisors (2101627785643).

22221211111021 is a wasteful number, since it uses less digits than its factorization.

22221211111021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28021703871.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 22221211111021 its reverse (12011111212222), we get a palindrome (34232322323243).

The spelling of 22221211111021 in words is "twenty-two trillion, two hundred twenty-one billion, two hundred eleven million, one hundred eleven thousand, twenty-one".