21481346808 has 48 divisors (see below), whose sum is σ = 59597647200. Its totient is φ = 6985802880.

The previous prime is 21481346791. The next prime is 21481346833. The reversal of 21481346808 is 80864318412.

It is a super-2 number, since 2×21481346808² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3635488 + ... + 3641391.

It is an arithmetic number, because the mean of its divisors is an integer number (1241617650).

Almost surely, 2^21481346808 is an apocalyptic number.

It is an amenable number.

21481346808 is an abundant number, since it is smaller than the sum of its proper divisors (38116300392).

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

21481346808 is a wasteful number, since it uses less digits than its factorization.

21481346808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7276932 (or 7276925 counting only the distinct ones).

The product of its (nonzero) digits is 294912, while the sum is 45.

The spelling of 21481346808 in words is "twenty-one billion, four hundred eighty-one million, three hundred forty-six thousand, eight hundred eight".