424223666021 has 2 divisors, whose sum is σ = 424223666022. Its totient is φ = 424223666020.

The previous prime is 424223665967. The next prime is 424223666063. The reversal of 424223666021 is 120666322424.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 234532929796 + 189690736225 = 484286^2 + 435535^2 .

It is a cyclic number.

It is not a de Polignac number, because 424223666021 - 2³⁴ = 407043796837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (424223666071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 212111833010 + 212111833011.

It is an arithmetic number, because the mean of its divisors is an integer number (212111833011).

Almost surely, 2^424223666021 is an apocalyptic number.

It is an amenable number.

424223666021 is a deficient number, since it is larger than the sum of its proper divisors (1).

424223666021 is an equidigital number, since it uses as much as digits as its factorization.

424223666021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 165888, while the sum is 38.

Adding to 424223666021 its reverse (120666322424), we get a palindrome (544889988445).

The spelling of 424223666021 in words is "four hundred twenty-four billion, two hundred twenty-three million, six hundred sixty-six thousand, twenty-one".