20422025021 has 2 divisors, whose sum is σ = 20422025022. Its totient is φ = 20422025020.

The previous prime is 20422025017. The next prime is 20422025023. The reversal of 20422025021 is 12052022402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20299125625 + 122899396 = 142475^2 + 11086^2 .

It is a cyclic number.

It is not a de Polignac number, because 20422025021 - 2² = 20422025017 is a prime.

Together with 20422025023, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20422024984 and 20422025002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20422025023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10211012510 + 10211012511.

It is an arithmetic number, because the mean of its divisors is an integer number (10211012511).

Almost surely, 2^20422025021 is an apocalyptic number.

It is an amenable number.

20422025021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20422025021 is an equidigital number, since it uses as much as digits as its factorization.

20422025021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 640, while the sum is 20.

Adding to 20422025021 its reverse (12052022402), we get a palindrome (32474047423).

The spelling of 20422025021 in words is "twenty billion, four hundred twenty-two million, twenty-five thousand, twenty-one".