21310534439 has 2 divisors, whose sum is σ = 21310534440. Its totient is φ = 21310534438.

The previous prime is 21310534373. The next prime is 21310534447. The reversal of 21310534439 is 93443501312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21310534439 - 2⁸ = 21310534183 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21310534399 and 21310534408.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21310534459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10655267219 + 10655267220.

It is an arithmetic number, because the mean of its divisors is an integer number (10655267220).

Almost surely, 2^21310534439 is an apocalyptic number.

21310534439 is a deficient number, since it is larger than the sum of its proper divisors (1).

21310534439 is an equidigital number, since it uses as much as digits as its factorization.

21310534439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 35.

The spelling of 21310534439 in words is "twenty-one billion, three hundred ten million, five hundred thirty-four thousand, four hundred thirty-nine".