21356267673376 has 48 divisors (see below), whose sum is σ = 42184047911544. Its totient is φ = 10642894239744.

The previous prime is 21356267673343. The next prime is 21356267673431. The reversal of 21356267673376 is 67337676265312.

It can be written as a sum of positive squares in 4 ways, for example, as 21308157637776 + 48110035600 = 4616076^2 + 219340^2 .

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 18698140 + ... + 19807396.

Almost surely, 2^{21356267673376} is an apocalyptic number.

It is an amenable number.

21356267673376 is a deficient number, since it is larger than the sum of its proper divisors (20827780238168).

21356267673376 is a wasteful number, since it uses less digits than its factorization.

21356267673376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1111253 (or 1111245 counting only the distinct ones).

The product of its digits is 240045120, while the sum is 64.

The spelling of 21356267673376 in words is "twenty-one trillion, three hundred fifty-six billion, two hundred sixty-seven million, six hundred seventy-three thousand, three hundred seventy-six".