21878286101 has 16 divisors (see below), whose sum is σ = 25116334464. Its totient is φ = 18668574144.

The previous prime is 21878286091. The next prime is 21878286107. The reversal of 21878286101 is 10168287812.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21878286101 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 (21878286107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1445891 + ... + 1460943.

It is an arithmetic number, because the mean of its divisors is an integer number (1569770904).

Almost surely, 2^21878286101 is an apocalyptic number.

It is an amenable number.

21878286101 is a deficient number, since it is larger than the sum of its proper divisors (3238048363).

21878286101 is a wasteful number, since it uses less digits than its factorization.

21878286101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15980.

The product of its (nonzero) digits is 86016, while the sum is 44.

The spelling of 21878286101 in words is "twenty-one billion, eight hundred seventy-eight million, two hundred eighty-six thousand, one hundred one".