21142126161684 has 48 divisors (see below), whose sum is σ = 59795912379840. Its totient is φ = 6406704897120.

The previous prime is 21142126161619. The next prime is 21142126161707. The reversal of 21142126161684 is 48616162124112.

21142126161684 is a `hidden beast` number, since 2 + 1 + 1 + 4 + 2 + 1 + 26 + 1 + 616 + 8 + 4 = 666.

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 15 ways as a sum of consecutive naturals, for example, 8898200059 + ... + 8898202434.

It is an arithmetic number, because the mean of its divisors is an integer number (1245748174580).

Almost surely, 2^{21142126161684} is an apocalyptic number.

It is an amenable number.

21142126161684 is an abundant number, since it is smaller than the sum of its proper divisors (38653786218156).

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

21142126161684 is a wasteful number, since it uses less digits than its factorization.

21142126161684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17796402517 (or 17796402509 counting only the distinct ones).

The product of its digits is 221184, while the sum is 45.

Adding to 21142126161684 its reverse (48616162124112), we get a palindrome (69758288285796).

The spelling of 21142126161684 in words is "twenty-one trillion, one hundred forty-two billion, one hundred twenty-six million, one hundred sixty-one thousand, six hundred eighty-four".