22111221002021 has 8 divisors (see below), whose sum is σ = 22121660016504. Its totient is φ = 22100784368320.

The previous prime is 22111221001993. The next prime is 22111221002023. The reversal of 22111221002021 is 12020012211122.

It can be written as a sum of positive squares in 4 ways, for example, as 9117899611396 + 12993321390625 = 3019586^2 + 3604625^2 .

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 22111221002021 - 2¹⁰ = 22111221000997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22111221002023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18122591 + ... + 19304163.

It is an arithmetic number, because the mean of its divisors is an integer number (2765207502063).

Almost surely, 2^{22111221002021} is an apocalyptic number.

It is an amenable number.

22111221002021 is a deficient number, since it is larger than the sum of its proper divisors (10439014483).

22111221002021 is a wasteful number, since it uses less digits than its factorization.

22111221002021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1190391.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 22111221002021 its reverse (12020012211122), we get a palindrome (34131233213143).

The spelling of 22111221002021 in words is "twenty-two trillion, one hundred eleven billion, two hundred twenty-one million, two thousand, twenty-one".