20412223021 has 2 divisors, whose sum is σ = 20412223022. Its totient is φ = 20412223020.

The previous prime is 20412222997. The next prime is 20412223067. The reversal of 20412223021 is 12032221402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16922367396 + 3489855625 = 130086^2 + 59075^2 .

It is a cyclic number.

It is not a de Polignac number, because 20412223021 - 2²⁹ = 19875352109 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20412223021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20412223081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10206111510 + 10206111511.

It is an arithmetic number, because the mean of its divisors is an integer number (10206111511).

Almost surely, 2^20412223021 is an apocalyptic number.

It is an amenable number.

20412223021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20412223021 is an equidigital number, since it uses as much as digits as its factorization.

20412223021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 20412223021 its reverse (12032221402), we get a palindrome (32444444423).

The spelling of 20412223021 in words is "twenty billion, four hundred twelve million, two hundred twenty-three thousand, twenty-one".