21878565088 has 24 divisors (see below), whose sum is σ = 43263190152. Its totient is φ = 10891088256.

The previous prime is 21878565031. The next prime is 21878565131. The reversal of 21878565088 is 88056587812.

It is a super-2 number, since 2×21878565088² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1498695 + ... + 1513222.

It is an arithmetic number, because the mean of its divisors is an integer number (1802632923).

Almost surely, 2^21878565088 is an apocalyptic number.

It is an amenable number.

21878565088 is a deficient number, since it is larger than the sum of its proper divisors (21384625064).

21878565088 is a wasteful number, since it uses less digits than its factorization.

21878565088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3012154 (or 3012146 counting only the distinct ones).

The product of its (nonzero) digits is 8601600, while the sum is 58.

The spelling of 21878565088 in words is "twenty-one billion, eight hundred seventy-eight million, five hundred sixty-five thousand, eighty-eight".