21045452347 has 2 divisors, whose sum is σ = 21045452348. Its totient is φ = 21045452346.

The previous prime is 21045452327. The next prime is 21045452377. The reversal of 21045452347 is 74325454012.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21045452347 is a prime.

It is a super-2 number, since 2×21045452347² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21045452327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10522726173 + 10522726174.

It is an arithmetic number, because the mean of its divisors is an integer number (10522726174).

Almost surely, 2^21045452347 is an apocalyptic number.

21045452347 is a deficient number, since it is larger than the sum of its proper divisors (1).

21045452347 is an equidigital number, since it uses as much as digits as its factorization.

21045452347 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 134400, while the sum is 37.

The spelling of 21045452347 in words is "twenty-one billion, forty-five million, four hundred fifty-two thousand, three hundred forty-seven".