21000353538878 has 8 divisors (see below), whose sum is σ = 36000606066672. Its totient is φ = 9000151516656.

The previous prime is 21000353538847. The next prime is 21000353538883. The reversal of 21000353538878 is 87883535300012.

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

It is a Curzon number.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 750012626375 + ... + 750012626402.

It is an arithmetic number, because the mean of its divisors is an integer number (4500075758334).

Almost surely, 2^{21000353538878} is an apocalyptic number.

21000353538878 is a deficient number, since it is larger than the sum of its proper divisors (15000252527794).

21000353538878 is a wasteful number, since it uses less digits than its factorization.

21000353538878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1500025252786.

The product of its (nonzero) digits is 4838400, while the sum is 53.

The spelling of 21000353538878 in words is "twenty-one trillion, three hundred fifty-three million, five hundred thirty-eight thousand, eight hundred seventy-eight".