21430713847 has 2 divisors, whose sum is σ = 21430713848. Its totient is φ = 21430713846.

The previous prime is 21430713809. The next prime is 21430713851. The reversal of 21430713847 is 74831703412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21430713847 - 2¹⁵ = 21430681079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21430711847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10715356923 + 10715356924.

It is an arithmetic number, because the mean of its divisors is an integer number (10715356924).

Almost surely, 2^21430713847 is an apocalyptic number.

21430713847 is a deficient number, since it is larger than the sum of its proper divisors (1).

21430713847 is an equidigital number, since it uses as much as digits as its factorization.

21430713847 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112896, while the sum is 40.

The spelling of 21430713847 in words is "twenty-one billion, four hundred thirty million, seven hundred thirteen thousand, eight hundred forty-seven".