21146681184 has 48 divisors (see below), whose sum is σ = 55539010800. Its totient is φ = 7045214720.

The previous prime is 21146681173. The next prime is 21146681207. The reversal of 21146681184 is 48118664112.

It is a tau number, because it is divible by the number of its divisors (48).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130594 + ... + 243614.

It is an arithmetic number, because the mean of its divisors is an integer number (1157062725).

Almost surely, 2^21146681184 is an apocalyptic number.

21146681184 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21146681184 is an abundant number, since it is smaller than the sum of its proper divisors (34392329616).

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

21146681184 is a wasteful number, since it uses less digits than its factorization.

21146681184 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114983 (or 114975 counting only the distinct ones).

The product of its digits is 73728, while the sum is 42.

The spelling of 21146681184 in words is "twenty-one billion, one hundred forty-six million, six hundred eighty-one thousand, one hundred eighty-four".