21048879940 has 24 divisors (see below), whose sum is σ = 48221070912. Its totient is φ = 7654138080.

The previous prime is 21048879931. The next prime is 21048879961. The reversal of 21048879940 is 4997884012.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47838144 + ... + 47838583.

It is an arithmetic number, because the mean of its divisors is an integer number (2009211288).

Almost surely, 2^21048879940 is an apocalyptic number.

21048879940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21048879940 is an abundant number, since it is smaller than the sum of its proper divisors (27172190972).

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

21048879940 is a wasteful number, since it uses less digits than its factorization.

21048879940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95676747 (or 95676745 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 52.

The spelling of 21048879940 in words is "twenty-one billion, forty-eight million, eight hundred seventy-nine thousand, nine hundred forty".