21097903063 has 2 divisors, whose sum is σ = 21097903064. Its totient is φ = 21097903062.

The previous prime is 21097903061. The next prime is 21097903093. The reversal of 21097903063 is 36030979012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21097903063 - 2¹ = 21097903061 is a prime.

Together with 21097903061, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21097903061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10548951531 + 10548951532.

It is an arithmetic number, because the mean of its divisors is an integer number (10548951532).

Almost surely, 2^21097903063 is an apocalyptic number.

21097903063 is a deficient number, since it is larger than the sum of its proper divisors (1).

21097903063 is an equidigital number, since it uses as much as digits as its factorization.

21097903063 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 61236, while the sum is 40.

The spelling of 21097903063 in words is "twenty-one billion, ninety-seven million, nine hundred three thousand, sixty-three".