21364717946 has 32 divisors (see below), whose sum is σ = 37708590528. Its totient is φ = 8950199040.

The previous prime is 21364717943. The next prime is 21364717999. The reversal of 21364717946 is 64971746312.

It is a junction number, because it is equal to n+sod(n) for n = 21364717894 and 21364717903.

It is not an unprimeable number, because it can be changed into a prime (21364717943) 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 in 15 ways as a sum of consecutive naturals, for example, 125810 + ... + 241986.

It is an arithmetic number, because the mean of its divisors is an integer number (1178393454).

Almost surely, 2^21364717946 is an apocalyptic number.

21364717946 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21364717946 is a deficient number, since it is larger than the sum of its proper divisors (16343872582).

21364717946 is a wasteful number, since it uses less digits than its factorization.

21364717946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116846.

The product of its digits is 1524096, while the sum is 50.

The spelling of 21364717946 in words is "twenty-one billion, three hundred sixty-four million, seven hundred seventeen thousand, nine hundred forty-six".