20422825021 has 2 divisors, whose sum is σ = 20422825022. Its totient is φ = 20422825020.

The previous prime is 20422825019. The next prime is 20422825081. The reversal of 20422825021 is 12052822402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18734765625 + 1688059396 = 136875^2 + 41086^2 .

It is a cyclic number.

It is not a de Polignac number, because 20422825021 - 2¹ = 20422825019 is a prime.

Together with 20422825019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20422825081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10211412510 + 10211412511.

It is an arithmetic number, because the mean of its divisors is an integer number (10211412511).

Almost surely, 2^20422825021 is an apocalyptic number.

It is an amenable number.

20422825021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20422825021 is an equidigital number, since it uses as much as digits as its factorization.

20422825021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5120, while the sum is 28.

The spelling of 20422825021 in words is "twenty billion, four hundred twenty-two million, eight hundred twenty-five thousand, twenty-one".