21884178034872 has 96 divisors (see below), whose sum is σ = 61184721826800. Its totient is φ = 7062027291648.

The previous prime is 21884178034871. The next prime is 21884178034889. The reversal of 21884178034872 is 27843087148812.

21884178034872 is a `hidden beast` number, since 2 + 1 + 8 + 84 + 1 + 78 + 0 + 3 + 487 + 2 = 666.

It is a super-2 number, since 2×21884178034872² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21884178034871) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 30926847 + ... + 31626542.

Almost surely, 2^{21884178034872} is an apocalyptic number.

It is an amenable number.

21884178034872 is an abundant number, since it is smaller than the sum of its proper divisors (39300543791928).

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

21884178034872 is a wasteful number, since it uses less digits than its factorization.

21884178034872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62553557 (or 62553550 counting only the distinct ones).

The product of its (nonzero) digits is 38535168, while the sum is 63.

The spelling of 21884178034872 in words is "twenty-one trillion, eight hundred eighty-four billion, one hundred seventy-eight million, thirty-four thousand, eight hundred seventy-two".