21423413303237 has 4 divisors (see below), whose sum is σ = 23370996330816. Its totient is φ = 19475830275660.

The previous prime is 21423413303207. The next prime is 21423413303263. The reversal of 21423413303237 is 73230331432412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21423413303237 - 2⁸ = 21423413302981 is a prime.

It is a super-2 number, since 2×21423413303237² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21423413303237.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21423413303207) 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 in 3 ways as a sum of consecutive naturals, for example, 973791513773 + ... + 973791513794.

It is an arithmetic number, because the mean of its divisors is an integer number (5842749082704).

Almost surely, 2^{21423413303237} is an apocalyptic number.

It is an amenable number.

21423413303237 is a deficient number, since it is larger than the sum of its proper divisors (1947583027579).

21423413303237 is a wasteful number, since it uses less digits than its factorization.

21423413303237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1947583027578.

The product of its (nonzero) digits is 217728, while the sum is 38.

Adding to 21423413303237 its reverse (73230331432412), we get a palindrome (94653744735649).

The spelling of 21423413303237 in words is "twenty-one trillion, four hundred twenty-three billion, four hundred thirteen million, three hundred three thousand, two hundred thirty-seven".