21440476741640 has 32 divisors (see below), whose sum is σ = 52626624730560. Its totient is φ = 7796536996800.

The previous prime is 21440476741639. The next prime is 21440476741667. The reversal of 21440476741640 is 4614767404412.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24364177676 + ... + 24364178555.

It is an arithmetic number, because the mean of its divisors is an integer number (1644582022830).

Almost surely, 2^{21440476741640} is an apocalyptic number.

21440476741640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21440476741640 is an abundant number, since it is smaller than the sum of its proper divisors (31186147988920).

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

21440476741640 is a wasteful number, since it uses less digits than its factorization.

21440476741640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48728356253 (or 48728356249 counting only the distinct ones).

The product of its (nonzero) digits is 3612672, while the sum is 50.

The spelling of 21440476741640 in words is "twenty-one trillion, four hundred forty billion, four hundred seventy-six million, seven hundred forty-one thousand, six hundred forty".