4220400230521 has 2 divisors, whose sum is σ = 4220400230522. Its totient is φ = 4220400230520.

The previous prime is 4220400230503. The next prime is 4220400230569. The reversal of 4220400230521 is 1250320040224.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4128166540521 + 92233690000 = 2031789^2 + 303700^2 .

It is a cyclic number.

It is not a de Polignac number, because 4220400230521 - 2³⁷ = 4082961277049 is a prime.

It is not a weakly prime, because it can be changed into another prime (4220400230021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2110200115260 + 2110200115261.

It is an arithmetic number, because the mean of its divisors is an integer number (2110200115261).

Almost surely, 2^{4220400230521} is an apocalyptic number.

It is an amenable number.

4220400230521 is a deficient number, since it is larger than the sum of its proper divisors (1).

4220400230521 is an equidigital number, since it uses as much as digits as its factorization.

4220400230521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3840, while the sum is 25.

Adding to 4220400230521 its reverse (1250320040224), we get a palindrome (5470720270745).

The spelling of 4220400230521 in words is "four trillion, two hundred twenty billion, four hundred million, two hundred thirty thousand, five hundred twenty-one".