221123729 has 8 divisors (see below), whose sum is σ = 239053440. Its totient is φ = 203823216.

The previous prime is 221123723. The next prime is 221123731. The reversal of 221123729 is 927321122.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221123729 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221123723) 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, 156569 + ... + 157974.

It is an arithmetic number, because the mean of its divisors is an integer number (29881680).

Almost surely, 2^221123729 is an apocalyptic number.

It is an amenable number.

221123729 is a deficient number, since it is larger than the sum of its proper divisors (17929711).

221123729 is a wasteful number, since it uses less digits than its factorization.

221123729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314599.

The product of its digits is 3024, while the sum is 29.

The square root of 221123729 is about 14870.2296216299. The cubic root of 221123729 is about 604.7071678963.

The spelling of 221123729 in words is "two hundred twenty-one million, one hundred twenty-three thousand, seven hundred twenty-nine".