21736489360 has 40 divisors (see below), whose sum is σ = 50614851960. Its totient is φ = 8681260032.

The previous prime is 21736489349. The next prime is 21736489361. The reversal of 21736489360 is 6398463712.

It can be written as a sum of positive squares in 4 ways, for example, as 6153461136 + 15583028224 = 78444^2 + 124832^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (21736489361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 155805 + ... + 260284.

It is an arithmetic number, because the mean of its divisors is an integer number (1265371299).

Almost surely, 2^21736489360 is an apocalyptic number.

21736489360 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21736489360 is an abundant number, since it is smaller than the sum of its proper divisors (28878362600).

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

21736489360 is a wasteful number, since it uses less digits than its factorization.

21736489360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416755 (or 416749 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 49.

The spelling of 21736489360 in words is "twenty-one billion, seven hundred thirty-six million, four hundred eighty-nine thousand, three hundred sixty".