21430030439 has 2 divisors, whose sum is σ = 21430030440. Its totient is φ = 21430030438.

The previous prime is 21430030421. The next prime is 21430030471. The reversal of 21430030439 is 93403003412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21430030439 - 2²⁰ = 21428981863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21430020439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10715015219 + 10715015220.

It is an arithmetic number, because the mean of its divisors is an integer number (10715015220).

Almost surely, 2^21430030439 is an apocalyptic number.

21430030439 is a deficient number, since it is larger than the sum of its proper divisors (1).

21430030439 is an equidigital number, since it uses as much as digits as its factorization.

21430030439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 29.

The spelling of 21430030439 in words is "twenty-one billion, four hundred thirty million, thirty thousand, four hundred thirty-nine".