221330029 has 4 divisors (see below), whose sum is σ = 221518620. Its totient is φ = 221141440.

The previous prime is 221329991. The next prime is 221330047. The reversal of 221330029 is 920033122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 920033122 = 2 ⋅460016561.

It can be written as a sum of positive squares in 2 ways, for example, as 202407529 + 18922500 = 14227^2 + 4350^2 .

It is a cyclic number.

It is not a de Polignac number, because 221330029 - 2¹⁵ = 221297261 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221329991 and 221330009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221330129) 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, 92524 + ... + 94885.

It is an arithmetic number, because the mean of its divisors is an integer number (55379655).

Almost surely, 2^221330029 is an apocalyptic number.

It is an amenable number.

221330029 is a deficient number, since it is larger than the sum of its proper divisors (188591).

221330029 is a wasteful number, since it uses less digits than its factorization.

221330029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188590.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 221330029 is about 14877.1646828285. The cubic root of 221330029 is about 604.8951656798.

The spelling of 221330029 in words is "two hundred twenty-one million, three hundred thirty thousand, twenty-nine".