13877640821 has 32 divisors (see below), whose sum is σ = 16236288000. Its totient is φ = 11721978880.

The previous prime is 13877640817. The next prime is 13877640827. The reversal of 13877640821 is 12804677831.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 13877640821 - 2² = 13877640817 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13877640827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4818860 + ... + 4821738.

It is an arithmetic number, because the mean of its divisors is an integer number (507384000).

Almost surely, 2^13877640821 is an apocalyptic number.

13877640821 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13877640821 is a deficient number, since it is larger than the sum of its proper divisors (2358647179).

13877640821 is a wasteful number, since it uses less digits than its factorization.

13877640821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3229.

The product of its (nonzero) digits is 451584, while the sum is 47.

The spelling of 13877640821 in words is "thirteen billion, eight hundred seventy-seven million, six hundred forty thousand, eight hundred twenty-one".