21613312775540 has 24 divisors (see below), whose sum is σ = 47776796662560. Its totient is φ = 8190307999008.

The previous prime is 21613312775491. The next prime is 21613312775591. The reversal of 21613312775540 is 4557721331612.

It is a super-3 number, since 3×21613312775540³ (a number of 41 digits) contains 333 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 (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28438569062 + ... + 28438569821.

It is an arithmetic number, because the mean of its divisors is an integer number (1990699860940).

Almost surely, 2^{21613312775540} is an apocalyptic number.

21613312775540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21613312775540 is an abundant number, since it is smaller than the sum of its proper divisors (26163483887020).

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

21613312775540 is a wasteful number, since it uses less digits than its factorization.

21613312775540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56877138911 (or 56877138909 counting only the distinct ones).

The product of its (nonzero) digits is 1058400, while the sum is 47.

The spelling of 21613312775540 in words is "twenty-one trillion, six hundred thirteen billion, three hundred twelve million, seven hundred seventy-five thousand, five hundred forty".