21041586440 has 64 divisors (see below), whose sum is σ = 54993980160. Its totient is φ = 7095985920.

The previous prime is 21041586437. The next prime is 21041586469. The reversal of 21041586440 is 4468514012.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 21041586440.

It is an unprimeable number.

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, 598892 + ... + 633051.

It is an arithmetic number, because the mean of its divisors is an integer number (859280940).

Almost surely, 2^21041586440 is an apocalyptic number.

21041586440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21041586440 is an abundant number, since it is smaller than the sum of its proper divisors (33952393720).

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

21041586440 is a wasteful number, since it uses less digits than its factorization.

21041586440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1232022 (or 1232018 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 35.

The spelling of 21041586440 in words is "twenty-one billion, forty-one million, five hundred eighty-six thousand, four hundred forty".