21254931418180 has 12 divisors (see below), whose sum is σ = 44635355978220. Its totient is φ = 8501972567264.

The previous prime is 21254931418141. The next prime is 21254931418243. The reversal of 21254931418180 is 8181413945212.

It can be written as a sum of positive squares in 2 ways, for example, as 8526762083844 + 12728169334336 = 2920062^2 + 3567656^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 531373285435 + ... + 531373285474.

It is an arithmetic number, because the mean of its divisors is an integer number (3719612998185).

Almost surely, 2^{21254931418180} is an apocalyptic number.

21254931418180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21254931418180 is an abundant number, since it is smaller than the sum of its proper divisors (23380424560040).

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

21254931418180 is a wasteful number, since it uses less digits than its factorization.

21254931418180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1062746570918 (or 1062746570916 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 49.

The spelling of 21254931418180 in words is "twenty-one trillion, two hundred fifty-four billion, nine hundred thirty-one million, four hundred eighteen thousand, one hundred eighty".