22020002021 has 4 divisors (see below), whose sum is σ = 22076609100. Its totient is φ = 21963394944.

The previous prime is 22020001963. The next prime is 22020002041. The reversal of 22020002021 is 12020002022.

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 4020828100 + 17999173921 = 63410^2 + 134161^2 .

It is a cyclic number.

It is not a de Polignac number, because 22020002021 - 2⁶ = 22020001957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22020001993 and 22020002011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22020002041) 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, 28302956 + ... + 28303733.

It is an arithmetic number, because the mean of its divisors is an integer number (5519152275).

Almost surely, 2^22020002021 is an apocalyptic number.

It is an amenable number.

22020002021 is a deficient number, since it is larger than the sum of its proper divisors (56607079).

22020002021 is an equidigital number, since it uses as much as digits as its factorization.

22020002021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56607078.

The product of its (nonzero) digits is 32, while the sum is 11.

Adding to 22020002021 its reverse (12020002022), we get a palindrome (34040004043).

Subtracting from 22020002021 its reverse (12020002022), we obtain a palindrome (9999999999).

The spelling of 22020002021 in words is "twenty-two billion, twenty million, two thousand, twenty-one".