21451650347 has 2 divisors, whose sum is σ = 21451650348. Its totient is φ = 21451650346.

The previous prime is 21451650323. The next prime is 21451650383. The reversal of 21451650347 is 74305615412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21451650347 - 2²⁰ = 21450601771 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21451650347.

It is not a weakly prime, because it can be changed into another prime (21451650397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10725825173 + 10725825174.

It is an arithmetic number, because the mean of its divisors is an integer number (10725825174).

Almost surely, 2^21451650347 is an apocalyptic number.

21451650347 is a deficient number, since it is larger than the sum of its proper divisors (1).

21451650347 is an equidigital number, since it uses as much as digits as its factorization.

21451650347 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 100800, while the sum is 38.

The spelling of 21451650347 in words is "twenty-one billion, four hundred fifty-one million, six hundred fifty thousand, three hundred forty-seven".