21440500337 has 2 divisors, whose sum is σ = 21440500338. Its totient is φ = 21440500336.

The previous prime is 21440500253. The next prime is 21440500397. The reversal of 21440500337 is 73300504412.

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., 12996912016 + 8443588321 = 114004^2 + 91889^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21440500337 is a prime.

It is a super-2 number, since 2×21440500337² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21440500397) 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, 10720250168 + 10720250169.

It is an arithmetic number, because the mean of its divisors is an integer number (10720250169).

Almost surely, 2^21440500337 is an apocalyptic number.

It is an amenable number.

21440500337 is a deficient number, since it is larger than the sum of its proper divisors (1).

21440500337 is an equidigital number, since it uses as much as digits as its factorization.

21440500337 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 29.

The spelling of 21440500337 in words is "twenty-one billion, four hundred forty million, five hundred thousand, three hundred thirty-seven".