20202202021 has 4 divisors (see below), whose sum is σ = 20219573952. Its totient is φ = 20184830092.

The previous prime is 20202201959. The next prime is 20202202049. The reversal of 20202202021 is 12020220202.

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 20202202021 - 2⁷ = 20202201893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20202201992 and 20202202010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20202202051) 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, 8684221 + ... + 8686546.

It is an arithmetic number, because the mean of its divisors is an integer number (5054893488).

Almost surely, 2^20202202021 is an apocalyptic number.

It is an amenable number.

20202202021 is a deficient number, since it is larger than the sum of its proper divisors (17371931).

20202202021 is a wasteful number, since it uses less digits than its factorization.

20202202021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17371930.

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

Adding to 20202202021 its reverse (12020220202), we get a palindrome (32222422223).

The spelling of 20202202021 in words is "twenty billion, two hundred two million, two hundred two thousand, twenty-one".