21480647748 has 48 divisors (see below), whose sum is σ = 57446882304. Its totient is φ = 6119632800.

The previous prime is 21480647701. The next prime is 21480647753. The reversal of 21480647748 is 84774608412.

It is a super-2 number, since 2×21480647748² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21480647748.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 339328 + ... + 397623.

It is an arithmetic number, because the mean of its divisors is an integer number (1196810048).

Almost surely, 2^21480647748 is an apocalyptic number.

21480647748 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21480647748 is an abundant number, since it is smaller than the sum of its proper divisors (35966234556).

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

21480647748 is a wasteful number, since it uses less digits than its factorization.

21480647748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 737312 (or 737310 counting only the distinct ones).

The product of its (nonzero) digits is 2408448, while the sum is 51.

The spelling of 21480647748 in words is "twenty-one billion, four hundred eighty million, six hundred forty-seven thousand, seven hundred forty-eight".