21163578346 has 8 divisors (see below), whose sum is σ = 31752399744. Its totient is φ = 10579445100.

The previous prime is 21163578287. The next prime is 21163578349. The reversal of 21163578346 is 64387536112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21163578296 and 21163578305.

It is not an unprimeable number, because it can be changed into a prime (21163578349) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1160730 + ... + 1178821.

It is an arithmetic number, because the mean of its divisors is an integer number (3969049968).

Almost surely, 2^21163578346 is an apocalyptic number.

21163578346 is a deficient number, since it is larger than the sum of its proper divisors (10588821398).

21163578346 is a wasteful number, since it uses less digits than its factorization.

21163578346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2344076.

The product of its digits is 725760, while the sum is 46.

The spelling of 21163578346 in words is "twenty-one billion, one hundred sixty-three million, five hundred seventy-eight thousand, three hundred forty-six".