20212033221 has 8 divisors (see below), whose sum is σ = 29943752960. Its totient is φ = 13474688796.

The previous prime is 20212033217. The next prime is 20212033223. The reversal of 20212033221 is 12233021202.

It is not a de Polignac number, because 20212033221 - 2² = 20212033217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20212033194 and 20212033203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20212033223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 374296885 + ... + 374296938.

It is an arithmetic number, because the mean of its divisors is an integer number (3742969120).

Almost surely, 2^20212033221 is an apocalyptic number.

It is an amenable number.

20212033221 is a deficient number, since it is larger than the sum of its proper divisors (9731719739).

20212033221 is an equidigital number, since it uses as much as digits as its factorization.

20212033221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 748593832 (or 748593826 counting only the distinct ones).

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

Adding to 20212033221 its reverse (12233021202), we get a palindrome (32445054423).

The spelling of 20212033221 in words is "twenty billion, two hundred twelve million, thirty-three thousand, two hundred twenty-one".