21023367347 has 2 divisors, whose sum is σ = 21023367348. Its totient is φ = 21023367346.

The previous prime is 21023367301. The next prime is 21023367353. The reversal of 21023367347 is 74376332012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21023367347 - 2⁶ = 21023367283 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21023367347.

It is not a weakly prime, because it can be changed into another prime (21023369347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511683673 + 10511683674.

It is an arithmetic number, because the mean of its divisors is an integer number (10511683674).

Almost surely, 2^21023367347 is an apocalyptic number.

21023367347 is a deficient number, since it is larger than the sum of its proper divisors (1).

21023367347 is an equidigital number, since it uses as much as digits as its factorization.

21023367347 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 127008, while the sum is 38.

Adding to 21023367347 its reverse (74376332012), we get a palindrome (95399699359).

The spelling of 21023367347 in words is "twenty-one billion, twenty-three million, three hundred sixty-seven thousand, three hundred forty-seven".