20212233021 has 10 divisors (see below), whose sum is σ = 30193582782. Its totient is φ = 13474821960.

The previous prime is 20212232993. The next prime is 20212233031. The reversal of 20212233021 is 12033221202.

It can be written as a sum of positive squares in only one way, i.e., 19800711225 + 411521796 = 140715^2 + 20286^2 .

It is not a de Polignac number, because 20212233021 - 2⁷ = 20212232893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20212232985 and 20212233003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20212233031) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 124766790 + ... + 124766951.

Almost surely, 2^20212233021 is an apocalyptic number.

It is an amenable number.

20212233021 is a deficient number, since it is larger than the sum of its proper divisors (9981349761).

20212233021 is an equidigital number, since it uses as much as digits as its factorization.

20212233021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249533753 (or 249533744 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 20212233021 its reverse (12033221202), we get a palindrome (32245454223).

The spelling of 20212233021 in words is "twenty billion, two hundred twelve million, two hundred thirty-three thousand, twenty-one".