20422921 has 2 divisors, whose sum is σ = 20422922. Its totient is φ = 20422920.

The previous prime is 20422903. The next prime is 20422939. The reversal of 20422921 is 12922402.

It is a balanced prime because it is at equal distance from previous prime (20422903) and next prime (20422939).

It can be written as a sum of positive squares in only one way, i.e., 10310521 + 10112400 = 3211^2 + 3180^2 .

It is a cyclic number.

It is not a de Polignac number, because 20422921 - 2¹³ = 20414729 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20422892 and 20422901.

It is not a weakly prime, because it can be changed into another prime (20422951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10211460 + 10211461.

It is an arithmetic number, because the mean of its divisors is an integer number (10211461).

Almost surely, 2^20422921 is an apocalyptic number.

It is an amenable number.

20422921 is a deficient number, since it is larger than the sum of its proper divisors (1).

20422921 is an equidigital number, since it uses as much as digits as its factorization.

20422921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 20422921 is about 4519.1726012623. The cubic root of 20422921 is about 273.3417386205.

The spelling of 20422921 in words is "twenty million, four hundred twenty-two thousand, nine hundred twenty-one".