21494961409180 has 72 divisors (see below), whose sum is σ = 53292838385808. Its totient is φ = 7259705494272.

The previous prime is 21494961409139. The next prime is 21494961409199. The reversal of 21494961409180 is 8190416949412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 163618177 + ... + 163749496.

It is an arithmetic number, because the mean of its divisors is an integer number (740178310914).

Almost surely, 2^{21494961409180} is an apocalyptic number.

21494961409180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21494961409180 is an abundant number, since it is smaller than the sum of its proper divisors (31797876976628).

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

21494961409180 is a wasteful number, since it uses less digits than its factorization.

21494961409180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327367763 (or 327367754 counting only the distinct ones).

The product of its (nonzero) digits is 4478976, while the sum is 58.

The spelling of 21494961409180 in words is "twenty-one trillion, four hundred ninety-four billion, nine hundred sixty-one million, four hundred nine thousand, one hundred eighty".