21063792903997 has 2 divisors, whose sum is σ = 21063792903998. Its totient is φ = 21063792903996.

The previous prime is 21063792903823. The next prime is 21063792904019. The reversal of 21063792903997 is 79930929736012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12470651767161 + 8593141136836 = 3531381^2 + 2931406^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21063792903997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21063792903397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10531896451998 + 10531896451999.

It is an arithmetic number, because the mean of its divisors is an integer number (10531896451999).

Almost surely, 2^{21063792903997} is an apocalyptic number.

It is an amenable number.

21063792903997 is a deficient number, since it is larger than the sum of its proper divisors (1).

21063792903997 is an equidigital number, since it uses as much as digits as its factorization.

21063792903997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69441624, while the sum is 67.

The spelling of 21063792903997 in words is "twenty-one trillion, sixty-three billion, seven hundred ninety-two million, nine hundred three thousand, nine hundred ninety-seven".