21878086732134 has 32 divisors (see below), whose sum is σ = 43872687106560. Its totient is φ = 7273280082912.

The previous prime is 21878086732111. The next prime is 21878086732147. The reversal of 21878086732134 is 43123768087812.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25311987 + ... + 26162049.

It is an arithmetic number, because the mean of its divisors is an integer number (1371021472080).

Almost surely, 2^{21878086732134} is an apocalyptic number.

21878086732134 is an abundant number, since it is smaller than the sum of its proper divisors (21994600374426).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21878086732134 is a wasteful number, since it uses less digits than its factorization.

21878086732134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 861484.

The product of its (nonzero) digits is 21676032, while the sum is 60.

The spelling of 21878086732134 in words is "twenty-one trillion, eight hundred seventy-eight billion, eighty-six million, seven hundred thirty-two thousand, one hundred thirty-four".