21326586056878 has 8 divisors (see below), whose sum is σ = 32000763707640. Its totient is φ = 10659664821000.

The previous prime is 21326586056827. The next prime is 21326586056891. The reversal of 21326586056878 is 87865068562312.

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

It is a super-2 number, since 2×21326586056878² (a number of 27 digits) contains 22 as substring.

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, 1814096373 + ... + 1814108128.

It is an arithmetic number, because the mean of its divisors is an integer number (4000095463455).

Almost surely, 2^{21326586056878} is an apocalyptic number.

21326586056878 is a deficient number, since it is larger than the sum of its proper divisors (10674177650762).

21326586056878 is a wasteful number, since it uses less digits than its factorization.

21326586056878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3628207442.

The product of its (nonzero) digits is 232243200, while the sum is 67.

The spelling of 21326586056878 in words is "twenty-one trillion, three hundred twenty-six billion, five hundred eighty-six million, fifty-six thousand, eight hundred seventy-eight".