21000107963 has 2 divisors, whose sum is σ = 21000107964. Its totient is φ = 21000107962.

The previous prime is 21000107917. The next prime is 21000107971. The reversal of 21000107963 is 36970100012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21000107963 - 2⁸ = 21000107707 is a prime.

It is not a weakly prime, because it can be changed into another prime (21000107983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500053981 + 10500053982.

It is an arithmetic number, because the mean of its divisors is an integer number (10500053982).

Almost surely, 2^21000107963 is an apocalyptic number.

21000107963 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000107963 is an equidigital number, since it uses as much as digits as its factorization.

21000107963 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 29.

Adding to 21000107963 its reverse (36970100012), we get a palindrome (57970207975).

The spelling of 21000107963 in words is "twenty-one billion, one hundred seven thousand, nine hundred sixty-three".