21022000111221 has 4 divisors (see below), whose sum is σ = 28029333481632. Its totient is φ = 14014666740812.

The previous prime is 21022000111187. The next prime is 21022000111283. The reversal of 21022000111221 is 12211100022012.

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 21022000111221 - 2¹⁰ = 21022000110197 is a prime.

It is a super-2 number, since 2×21022000111221² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21022000111221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022000111921) 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, 3503666685201 + ... + 3503666685206.

It is an arithmetic number, because the mean of its divisors is an integer number (7007333370408).

Almost surely, 2^{21022000111221} is an apocalyptic number.

It is an amenable number.

21022000111221 is a deficient number, since it is larger than the sum of its proper divisors (7007333370411).

21022000111221 is an equidigital number, since it uses as much as digits as its factorization.

21022000111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7007333370410.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21022000111221 its reverse (12211100022012), we get a palindrome (33233100133233).

The spelling of 21022000111221 in words is "twenty-one trillion, twenty-two billion, one hundred eleven thousand, two hundred twenty-one".