21232097180 has 96 divisors (see below), whose sum is σ = 53217561600. Its totient is φ = 6957181440.

The previous prime is 21232097177. The next prime is 21232097221. The reversal of 21232097180 is 8179023212.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 21232097180.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5468840 + ... + 5472720.

It is an arithmetic number, because the mean of its divisors is an integer number (554349600).

Almost surely, 2^21232097180 is an apocalyptic number.

21232097180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21232097180, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26608780800).

21232097180 is an abundant number, since it is smaller than the sum of its proper divisors (31985464420).

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

21232097180 is a wasteful number, since it uses less digits than its factorization.

21232097180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5619 (or 5617 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 35.

The spelling of 21232097180 in words is "twenty-one billion, two hundred thirty-two million, ninety-seven thousand, one hundred eighty".