21263316740 has 12 divisors (see below), whose sum is σ = 44652965196. Its totient is φ = 8505326688.

The previous prime is 21263316707. The next prime is 21263316799. The reversal of 21263316740 is 4761336212.

It can be written as a sum of positive squares in 2 ways, for example, as 3474159364 + 17789157376 = 58942^2 + 133376^2 .

It is a super-3 number, since 3×21263316740³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21263316740.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 531582899 + ... + 531582938.

It is an arithmetic number, because the mean of its divisors is an integer number (3721080433).

Almost surely, 2^21263316740 is an apocalyptic number.

21263316740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21263316740 is an abundant number, since it is smaller than the sum of its proper divisors (23389648456).

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

21263316740 is a wasteful number, since it uses less digits than its factorization.

21263316740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1063165846 (or 1063165844 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 35.

The spelling of 21263316740 in words is "twenty-one billion, two hundred sixty-three million, three hundred sixteen thousand, seven hundred forty".