21365943480 has 160 divisors (see below), whose sum is σ = 82072441440. Its totient is φ = 4883639040.

The previous prime is 21365943463. The next prime is 21365943481. The reversal of 21365943480 is 8434956312.

21365943480 is a `hidden beast` number, since 2 + 13 + 6 + 594 + 3 + 48 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21365943481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 448351 + ... + 493710.

It is an arithmetic number, because the mean of its divisors is an integer number (512952759).

Almost surely, 2^21365943480 is an apocalyptic number.

21365943480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21365943480 is an abundant number, since it is smaller than the sum of its proper divisors (60706497960).

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

21365943480 is a wasteful number, since it uses less digits than its factorization.

21365943480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 942091 (or 942078 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 45.

The spelling of 21365943480 in words is "twenty-one billion, three hundred sixty-five million, nine hundred forty-three thousand, four hundred eighty".