22221211021021 has 4 divisors (see below), whose sum is σ = 23390748443200. Its totient is φ = 21051673598844.

The previous prime is 22221211021001. The next prime is 22221211021111. The reversal of 22221211021021 is 12012011212222.

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 22221211021021 - 2⁷ = 22221211020893 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 1169537422159 = 22221211021021 / (2 + 2 + 2 + 2 + 1 + 2 + 1 + 1 + 0 + 2 + 1 + 0 + 2 + 1).

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 22221211021021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22221211021001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 584768711061 + ... + 584768711098.

It is an arithmetic number, because the mean of its divisors is an integer number (5847687110800).

Almost surely, 2^{22221211021021} is an apocalyptic number.

It is an amenable number.

22221211021021 is a deficient number, since it is larger than the sum of its proper divisors (1169537422179).

22221211021021 is a wasteful number, since it uses less digits than its factorization.

22221211021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1169537422178.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 22221211021021 its reverse (12012011212222), we get a palindrome (34233222233243).

The spelling of 22221211021021 in words is "twenty-two trillion, two hundred twenty-one billion, two hundred eleven million, twenty-one thousand, twenty-one".