22011202021 has 4 divisors (see below), whose sum is σ = 22015709100. Its totient is φ = 22006694944.

The previous prime is 22011201991. The next prime is 22011202027. The reversal of 22011202021 is 12020211022.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7668504900 + 14342697121 = 87570^2 + 119761^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22011202021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22011201992 and 22011202010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22011202027) 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, 2246206 + ... + 2255983.

It is an arithmetic number, because the mean of its divisors is an integer number (5503927275).

Almost surely, 2^22011202021 is an apocalyptic number.

It is an amenable number.

22011202021 is a deficient number, since it is larger than the sum of its proper divisors (4507079).

22011202021 is an equidigital number, since it uses as much as digits as its factorization.

22011202021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4507078.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 22011202021 its reverse (12020211022), we get a palindrome (34031413043).

Subtracting from 22011202021 its reverse (12020211022), we obtain a palindrome (9990990999).

The spelling of 22011202021 in words is "twenty-two billion, eleven million, two hundred two thousand, twenty-one".