21786379963 has 6 divisors (see below), whose sum is σ = 22993382004. Its totient is φ = 20639728044.

The previous prime is 21786379939. The next prime is 21786380029. The reversal of 21786379963 is 36997368712.

It is not a de Polignac number, because 21786379963 - 2⁵ = 21786379931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21786379913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 30174681 + ... + 30175402.

It is an arithmetic number, because the mean of its divisors is an integer number (3832230334).

Almost surely, 2^21786379963 is an apocalyptic number.

21786379963 is a deficient number, since it is larger than the sum of its proper divisors (1207002041).

21786379963 is an equidigital number, since it uses as much as digits as its factorization.

21786379963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60350121 (or 60350102 counting only the distinct ones).

The product of its digits is 20575296, while the sum is 61.

The spelling of 21786379963 in words is "twenty-one billion, seven hundred eighty-six million, three hundred seventy-nine thousand, nine hundred sixty-three".