20022202021 has 4 divisors (see below), whose sum is σ = 20022994944. Its totient is φ = 20021409100.

The previous prime is 20022202009. The next prime is 20022202037. The reversal of 20022202021 is 12020222002.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12020222002 = 2 ⋅6010111001.

It is a cyclic number.

It is not a de Polignac number, because 20022202021 - 2⁷ = 20022201893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20022201992 and 20022202010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20022202001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 357295 + ... + 409516.

It is an arithmetic number, because the mean of its divisors is an integer number (5005748736).

Almost surely, 2^20022202021 is an apocalyptic number.

It is an amenable number.

20022202021 is a deficient number, since it is larger than the sum of its proper divisors (792923).

20022202021 is an equidigital number, since it uses as much as digits as its factorization.

20022202021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 792922.

The product of its (nonzero) digits is 64, while the sum is 13.

Adding to 20022202021 its reverse (12020222002), we get a palindrome (32042424023).

The spelling of 20022202021 in words is "twenty billion, twenty-two million, two hundred two thousand, twenty-one".