21424030237 has 2 divisors, whose sum is σ = 21424030238. Its totient is φ = 21424030236.

The previous prime is 21424030217. The next prime is 21424030247. The reversal of 21424030237 is 73203042412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21368884761 + 55145476 = 146181^2 + 7426^2 .

It is a cyclic number.

It is not a de Polignac number, because 21424030237 - 2³¹ = 19276546589 is a prime.

It is a super-3 number, since 3×21424030237³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21424030217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10712015118 + 10712015119.

It is an arithmetic number, because the mean of its divisors is an integer number (10712015119).

Almost surely, 2^21424030237 is an apocalyptic number.

It is an amenable number.

21424030237 is a deficient number, since it is larger than the sum of its proper divisors (1).

21424030237 is an equidigital number, since it uses as much as digits as its factorization.

21424030237 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 28.

Adding to 21424030237 its reverse (73203042412), we get a palindrome (94627072649).

The spelling of 21424030237 in words is "twenty-one billion, four hundred twenty-four million, thirty thousand, two hundred thirty-seven".