221151616727 has 8 divisors (see below), whose sum is σ = 234165012336. Its totient is φ = 208138718592.

The previous prime is 221151616723. The next prime is 221151616739. The reversal of 221151616727 is 727616151122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221151616727 - 2² = 221151616723 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 (221151616723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1184588 + ... + 1358510.

It is an arithmetic number, because the mean of its divisors is an integer number (29270626542).

Almost surely, 2^221151616727 is an apocalyptic number.

221151616727 is a deficient number, since it is larger than the sum of its proper divisors (13013395609).

221151616727 is a wasteful number, since it uses less digits than its factorization.

221151616727 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248737.

The product of its digits is 70560, while the sum is 41.

Adding to 221151616727 its reverse (727616151122), we get a palindrome (948767767849).

The spelling of 221151616727 in words is "two hundred twenty-one billion, one hundred fifty-one million, six hundred sixteen thousand, seven hundred twenty-seven".