21613445340607 has 4 divisors (see below), whose sum is σ = 22553160355440. Its totient is φ = 20673730325776.

The previous prime is 21613445340593. The next prime is 21613445340659. The reversal of 21613445340607 is 70604354431612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21613445340607 - 2²³ = 21613436951999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21613445340677) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 469857507382 + ... + 469857507427.

It is an arithmetic number, because the mean of its divisors is an integer number (5638290088860).

Almost surely, 2^{21613445340607} is an apocalyptic number.

21613445340607 is a deficient number, since it is larger than the sum of its proper divisors (939715014833).

21613445340607 is an equidigital number, since it uses as much as digits as its factorization.

21613445340607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 939715014832.

The product of its (nonzero) digits is 1451520, while the sum is 46.

The spelling of 21613445340607 in words is "twenty-one trillion, six hundred thirteen billion, four hundred forty-five million, three hundred forty thousand, six hundred seven".