21394345376 has 48 divisors (see below), whose sum is σ = 42281870400. Its totient is φ = 10656188928.

The previous prime is 21394345369. The next prime is 21394345391. The reversal of 21394345376 is 67354349312.

It is a super-3 number, since 3×21394345376³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21394345376.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11998181 + ... + 11999963.

It is an arithmetic number, because the mean of its divisors is an integer number (880872300).

Almost surely, 2^21394345376 is an apocalyptic number.

It is an amenable number.

21394345376 is a deficient number, since it is larger than the sum of its proper divisors (20887525024).

21394345376 is a wasteful number, since it uses less digits than its factorization.

21394345376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3021 (or 3013 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 47.

The spelling of 21394345376 in words is "twenty-one billion, three hundred ninety-four million, three hundred forty-five thousand, three hundred seventy-six".