21647046307 has 2 divisors, whose sum is σ = 21647046308. Its totient is φ = 21647046306.

The previous prime is 21647046301. The next prime is 21647046349. The reversal of 21647046307 is 70364074612.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21647046307 is a prime.

It is a super-2 number, since 2×21647046307² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21647046307.

It is not a weakly prime, because it can be changed into another prime (21647046301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10823523153 + 10823523154.

It is an arithmetic number, because the mean of its divisors is an integer number (10823523154).

Almost surely, 2^21647046307 is an apocalyptic number.

21647046307 is a deficient number, since it is larger than the sum of its proper divisors (1).

21647046307 is an equidigital number, since it uses as much as digits as its factorization.

21647046307 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 169344, while the sum is 40.

The spelling of 21647046307 in words is "twenty-one billion, six hundred forty-seven million, forty-six thousand, three hundred seven".