21403214347 has 2 divisors, whose sum is σ = 21403214348. Its totient is φ = 21403214346.

The previous prime is 21403214311. The next prime is 21403214419. The reversal of 21403214347 is 74341230412.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21403214347 is a prime.

It is not a weakly prime, because it can be changed into another prime (21403214747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10701607173 + 10701607174.

It is an arithmetic number, because the mean of its divisors is an integer number (10701607174).

Almost surely, 2^21403214347 is an apocalyptic number.

21403214347 is a deficient number, since it is larger than the sum of its proper divisors (1).

21403214347 is an equidigital number, since it uses as much as digits as its factorization.

21403214347 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 31.

Adding to 21403214347 its reverse (74341230412), we get a palindrome (95744444759).

The spelling of 21403214347 in words is "twenty-one billion, four hundred three million, two hundred fourteen thousand, three hundred forty-seven".