21018134180 has 24 divisors (see below), whose sum is σ = 44305918272. Its totient is φ = 8375284832.

The previous prime is 21018134167. The next prime is 21018134201. The reversal of 21018134180 is 8143181012.

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, 1992662 + ... + 2003181.

It is an arithmetic number, because the mean of its divisors is an integer number (1846079928).

Almost surely, 2^21018134180 is an apocalyptic number.

21018134180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21018134180 is an abundant number, since it is smaller than the sum of its proper divisors (23287784092).

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

21018134180 is a wasteful number, since it uses less digits than its factorization.

21018134180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3996115 (or 3996113 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 29.

The spelling of 21018134180 in words is "twenty-one billion, eighteen million, one hundred thirty-four thousand, one hundred eighty".