221007329 has 4 divisors (see below), whose sum is σ = 221122560. Its totient is φ = 220892100.

The previous prime is 221007313. The next prime is 221007341. The reversal of 221007329 is 923700122.

221007329 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221007329 - 2⁴ = 221007313 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221007298 and 221007307.

It is not an unprimeable number, because it can be changed into a prime (221007389) 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, 54689 + ... + 58590.

It is an arithmetic number, because the mean of its divisors is an integer number (55280640).

Almost surely, 2^221007329 is an apocalyptic number.

It is an amenable number.

221007329 is a deficient number, since it is larger than the sum of its proper divisors (115231).

221007329 is a wasteful number, since it uses less digits than its factorization.

221007329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115230.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 221007329 is about 14866.3152462202. The cubic root of 221007329 is about 604.6010428940.

The spelling of 221007329 in words is "two hundred twenty-one million, seven thousand, three hundred twenty-nine".