21352234439 has 2 divisors, whose sum is σ = 21352234440. Its totient is φ = 21352234438.

The previous prime is 21352234367. The next prime is 21352234457. The reversal of 21352234439 is 93443225312.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21352234439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21352234459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10676117219 + 10676117220.

It is an arithmetic number, because the mean of its divisors is an integer number (10676117220).

Almost surely, 2^21352234439 is an apocalyptic number.

21352234439 is a deficient number, since it is larger than the sum of its proper divisors (1).

21352234439 is an equidigital number, since it uses as much as digits as its factorization.

21352234439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 38.

The spelling of 21352234439 in words is "twenty-one billion, three hundred fifty-two million, two hundred thirty-four thousand, four hundred thirty-nine".