221640307430735 has 4 divisors (see below), whose sum is σ = 265968368916888. Its totient is φ = 177312245944584.

The previous prime is 221640307430639. The next prime is 221640307430923. The reversal of 221640307430735 is 537034703046122.

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 221640307430735 - 2⁴⁰ = 220540795802959 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221640307430735.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22164030743069 + ... + 22164030743078.

It is an arithmetic number, because the mean of its divisors is an integer number (66492092229222).

Almost surely, 2^{221640307430735} is an apocalyptic number.

221640307430735 is a deficient number, since it is larger than the sum of its proper divisors (44328061486153).

221640307430735 is an equidigital number, since it uses as much as digits as its factorization.

221640307430735 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44328061486152.

The product of its (nonzero) digits is 2540160, while the sum is 47.

The spelling of 221640307430735 in words is "two hundred twenty-one trillion, six hundred forty billion, three hundred seven million, four hundred thirty thousand, seven hundred thirty-five".