21191732363 has 2 divisors, whose sum is σ = 21191732364. Its totient is φ = 21191732362.

The previous prime is 21191732357. The next prime is 21191732377. The reversal of 21191732363 is 36323719112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21191732363 - 2¹⁸ = 21191470219 is a prime.

It is not a weakly prime, because it can be changed into another prime (21191738363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10595866181 + 10595866182.

It is an arithmetic number, because the mean of its divisors is an integer number (10595866182).

Almost surely, 2^21191732363 is an apocalyptic number.

21191732363 is a deficient number, since it is larger than the sum of its proper divisors (1).

21191732363 is an equidigital number, since it uses as much as digits as its factorization.

21191732363 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 38.

The spelling of 21191732363 in words is "twenty-one billion, one hundred ninety-one million, seven hundred thirty-two thousand, three hundred sixty-three".