13621681812 has 48 divisors (see below), whose sum is σ = 31884834240. Its totient is φ = 4526172672.

The previous prime is 13621681811. The next prime is 13621681861. The reversal of 13621681812 is 21818612631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13621681811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7256218 + ... + 7258094.

It is an arithmetic number, because the mean of its divisors is an integer number (664267380).

Almost surely, 2^13621681812 is an apocalyptic number.

13621681812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

13621681812 is an abundant number, since it is smaller than the sum of its proper divisors (18263152428).

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

13621681812 is a wasteful number, since it uses less digits than its factorization.

13621681812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3480 (or 3478 counting only the distinct ones).

The product of its digits is 27648, while the sum is 39.

The spelling of 13621681812 in words is "thirteen billion, six hundred twenty-one million, six hundred eighty-one thousand, eight hundred twelve".