22020343621 has 2 divisors, whose sum is σ = 22020343622. Its totient is φ = 22020343620.

The previous prime is 22020343549. The next prime is 22020343643. The reversal of 22020343621 is 12634302022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11222224225 + 10798119396 = 105935^2 + 103914^2 .

It is a cyclic number.

It is not a de Polignac number, because 22020343621 - 2¹³ = 22020335429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22020343921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11010171810 + 11010171811.

It is an arithmetic number, because the mean of its divisors is an integer number (11010171811).

Almost surely, 2^22020343621 is an apocalyptic number.

It is an amenable number.

22020343621 is a deficient number, since it is larger than the sum of its proper divisors (1).

22020343621 is an equidigital number, since it uses as much as digits as its factorization.

22020343621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 22020343621 its reverse (12634302022), we get a palindrome (34654645643).

The spelling of 22020343621 in words is "twenty-two billion, twenty million, three hundred forty-three thousand, six hundred twenty-one".