221501665743 has 4 divisors (see below), whose sum is σ = 295335554328. Its totient is φ = 147667777160.

The previous prime is 221501665643. The next prime is 221501665757. The reversal of 221501665743 is 347566105122.

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 221501665743 - 2³² = 217206698447 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221501665695 and 221501665704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221501665793) 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, 36916944288 + ... + 36916944293.

It is an arithmetic number, because the mean of its divisors is an integer number (73833888582).

Almost surely, 2^221501665743 is an apocalyptic number.

221501665743 is a deficient number, since it is larger than the sum of its proper divisors (73833888585).

221501665743 is an equidigital number, since it uses as much as digits as its factorization.

221501665743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73833888584.

The product of its (nonzero) digits is 302400, while the sum is 42.

The spelling of 221501665743 in words is "two hundred twenty-one billion, five hundred one million, six hundred sixty-five thousand, seven hundred forty-three".