21085396363 has 2 divisors, whose sum is σ = 21085396364. Its totient is φ = 21085396362.

The previous prime is 21085396333. The next prime is 21085396379. The reversal of 21085396363 is 36369358012.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21085396363 is a prime.

It is not a weakly prime, because it can be changed into another prime (21085396333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10542698181 + 10542698182.

It is an arithmetic number, because the mean of its divisors is an integer number (10542698182).

Almost surely, 2^21085396363 is an apocalyptic number.

21085396363 is a deficient number, since it is larger than the sum of its proper divisors (1).

21085396363 is an equidigital number, since it uses as much as digits as its factorization.

21085396363 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 699840, while the sum is 46.

The spelling of 21085396363 in words is "twenty-one billion, eighty-five million, three hundred ninety-six thousand, three hundred sixty-three".