21404114437 has 2 divisors, whose sum is σ = 21404114438. Its totient is φ = 21404114436.

The previous prime is 21404114399. The next prime is 21404114443. The reversal of 21404114437 is 73441140412.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18259035876 + 3145078561 = 135126^2 + 56081^2 .

It is a cyclic number.

It is not a de Polignac number, because 21404114437 - 2¹⁹ = 21403590149 is a prime.

It is a super-2 number, since 2×21404114437² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21404114399 and 21404114408.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21404114447) 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, 10702057218 + 10702057219.

It is an arithmetic number, because the mean of its divisors is an integer number (10702057219).

Almost surely, 2^21404114437 is an apocalyptic number.

It is an amenable number.

21404114437 is a deficient number, since it is larger than the sum of its proper divisors (1).

21404114437 is an equidigital number, since it uses as much as digits as its factorization.

21404114437 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10752, while the sum is 31.

Adding to 21404114437 its reverse (73441140412), we get a palindrome (94845254849).

The spelling of 21404114437 in words is "twenty-one billion, four hundred four million, one hundred fourteen thousand, four hundred thirty-seven".