21101300180 has 24 divisors (see below), whose sum is σ = 44317980672. Its totient is φ = 8439520032.

The previous prime is 21101300179. The next prime is 21101300243. The reversal of 21101300180 is 8100310112.

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, 124109 + ... + 240011.

It is an arithmetic number, because the mean of its divisors is an integer number (1846582528).

Almost surely, 2^21101300180 is an apocalyptic number.

21101300180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21101300180 is an abundant number, since it is smaller than the sum of its proper divisors (23216680492).

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

21101300180 is a wasteful number, since it uses less digits than its factorization.

21101300180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125015 (or 125013 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 21101300180 its reverse (8100310112), we get a palindrome (29201610292).

The spelling of 21101300180 in words is "twenty-one billion, one hundred one million, three hundred thousand, one hundred eighty".