220729521 has 8 divisors (see below), whose sum is σ = 295570080. Its totient is φ = 146520992.

The previous prime is 220729511. The next prime is 220729543. The reversal of 220729521 is 125927022.

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 220729521 - 2¹³ = 220721329 is a prime.

It is not an unprimeable number, because it can be changed into a prime (220729501) 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, 157191 + ... + 158588.

It is an arithmetic number, because the mean of its divisors is an integer number (36946260).

Almost surely, 2^220729521 is an apocalyptic number.

It is an amenable number.

220729521 is a deficient number, since it is larger than the sum of its proper divisors (74840559).

220729521 is a wasteful number, since it uses less digits than its factorization.

220729521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316015.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 220729521 is about 14856.9687688976. The cubic root of 220729521 is about 604.3476072071.

The spelling of 220729521 in words is "two hundred twenty million, seven hundred twenty-nine thousand, five hundred twenty-one".