12811917420 has 72 divisors (see below), whose sum is σ = 40302195024. Its totient is φ = 3416510016.

The previous prime is 12811917409. The next prime is 12811917473. The reversal of 12811917420 is 2471911821.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 1313239 + ... + 1322958.

Almost surely, 2^12811917420 is an apocalyptic number.

12811917420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12811917420 is an abundant number, since it is smaller than the sum of its proper divisors (27490277604).

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

12811917420 is a wasteful number, since it uses less digits than its factorization.

12811917420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2636221 (or 2636207 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The spelling of 12811917420 in words is "twelve billion, eight hundred eleven million, nine hundred seventeen thousand, four hundred twenty".