21613136740 has 24 divisors (see below), whose sum is σ = 48878940600. Its totient is φ = 7980235008.

The previous prime is 21613136723. The next prime is 21613136789. The reversal of 21613136740 is 4763131612.

It can be written as a sum of positive squares in 4 ways, for example, as 490002496 + 21123134244 = 22136^2 + 145338^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21613136696 and 21613136705.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41563465 + ... + 41563984.

It is an arithmetic number, because the mean of its divisors is an integer number (2036622525).

Almost surely, 2^21613136740 is an apocalyptic number.

21613136740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21613136740 is an abundant number, since it is smaller than the sum of its proper divisors (27265803860).

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

21613136740 is a wasteful number, since it uses less digits than its factorization.

21613136740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83127471 (or 83127469 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 34.

The spelling of 21613136740 in words is "twenty-one billion, six hundred thirteen million, one hundred thirty-six thousand, seven hundred forty".