21959701180 has 12 divisors (see below), whose sum is σ = 46115372520. Its totient is φ = 8783880464.

The previous prime is 21959701163. The next prime is 21959701189. The reversal of 21959701180 is 8110795912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21959701189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 548992510 + ... + 548992549.

It is an arithmetic number, because the mean of its divisors is an integer number (3842947710).

Almost surely, 2^21959701180 is an apocalyptic number.

21959701180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21959701180 is an abundant number, since it is smaller than the sum of its proper divisors (24155671340).

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

21959701180 is a wasteful number, since it uses less digits than its factorization.

21959701180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1097985068 (or 1097985066 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 43.

The spelling of 21959701180 in words is "twenty-one billion, nine hundred fifty-nine million, seven hundred one thousand, one hundred eighty".