21878899080 has 32 divisors (see below), whose sum is σ = 65636697600. Its totient is φ = 5834373056.

The previous prime is 21878899073. The next prime is 21878899087. The reversal of 21878899080 is 8099887812.

It is an interprime number because it is at equal distance from previous prime (21878899073) and next prime (21878899087).

It is a Harshad number since it is a multiple of its sum of digits (60).

It is not an unprimeable number, because it can be changed into a prime (21878899087) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 91161960 + ... + 91162199.

It is an arithmetic number, because the mean of its divisors is an integer number (2051146800).

Almost surely, 2^21878899080 is an apocalyptic number.

21878899080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21878899080 is an abundant number, since it is smaller than the sum of its proper divisors (43757798520).

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

21878899080 is a wasteful number, since it uses less digits than its factorization.

21878899080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182324173 (or 182324169 counting only the distinct ones).

The product of its (nonzero) digits is 4644864, while the sum is 60.

The spelling of 21878899080 in words is "twenty-one billion, eight hundred seventy-eight million, eight hundred ninety-nine thousand, eighty".