29309221 has 4 divisors (see below), whose sum is σ = 29388172. Its totient is φ = 29230272.

The previous prime is 29309201. The next prime is 29309233. The reversal of 29309221 is 12290392.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21390625 + 7918596 = 4625^2 + 2814^2 .

It is a cyclic number.

It is not a de Polignac number, because 29309221 - 2⁹ = 29308709 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 29309221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29309201) 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, 38916 + ... + 39661.

It is an arithmetic number, because the mean of its divisors is an integer number (7347043).

Almost surely, 2^29309221 is an apocalyptic number.

It is an amenable number.

29309221 is a deficient number, since it is larger than the sum of its proper divisors (78951).

29309221 is an equidigital number, since it uses as much as digits as its factorization.

29309221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78950.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 29309221 is about 5413.7991281539. The cubic root of 29309221 is about 308.3198068248.

The spelling of 29309221 in words is "twenty-nine million, three hundred nine thousand, two hundred twenty-one".