21034423337 has 2 divisors, whose sum is σ = 21034423338. Its totient is φ = 21034423336.

The previous prime is 21034423313. The next prime is 21034423411. The reversal of 21034423337 is 73332443012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18111507241 + 2922916096 = 134579^2 + 54064^2 .

It is a cyclic number.

It is not a de Polignac number, because 21034423337 - 2²⁸ = 20765987881 is a prime.

It is not a weakly prime, because it can be changed into another prime (21034429337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10517211668 + 10517211669.

It is an arithmetic number, because the mean of its divisors is an integer number (10517211669).

Almost surely, 2^21034423337 is an apocalyptic number.

It is an amenable number.

21034423337 is a deficient number, since it is larger than the sum of its proper divisors (1).

21034423337 is an equidigital number, since it uses as much as digits as its factorization.

21034423337 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 32.

Adding to 21034423337 its reverse (73332443012), we get a palindrome (94366866349).

The spelling of 21034423337 in words is "twenty-one billion, thirty-four million, four hundred twenty-three thousand, three hundred thirty-seven".