22021030021 has 8 divisors (see below), whose sum is σ = 22103523288. Its totient is φ = 21938688000.

The previous prime is 22021029973. The next prime is 22021030051. The reversal of 22021030021 is 12003012022.

It can be written as a sum of positive squares in 4 ways, for example, as 7648377025 + 14372652996 = 87455^2 + 119886^2 .

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 22021030021 - 2³¹ = 19873546373 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22021029983 and 22021030010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22021030051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 258241 + ... + 332761.

It is an arithmetic number, because the mean of its divisors is an integer number (2762940411).

Almost surely, 2^22021030021 is an apocalyptic number.

It is an amenable number.

22021030021 is a deficient number, since it is larger than the sum of its proper divisors (82493267).

22021030021 is an equidigital number, since it uses as much as digits as its factorization.

22021030021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75623.

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 22021030021 its reverse (12003012022), we get a palindrome (34024042043).

The spelling of 22021030021 in words is "twenty-two billion, twenty-one million, thirty thousand, twenty-one".