29031221 has 16 divisors (see below), whose sum is σ = 32931840. Its totient is φ = 25446960.

The previous prime is 29031217. The next prime is 29031241. The reversal of 29031221 is 12213092.

It is a cyclic number.

It is not a de Polignac number, because 29031221 - 2² = 29031217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 29031193 and 29031202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29031241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12476 + ... + 14618.

It is an arithmetic number, because the mean of its divisors is an integer number (2058240).

Almost surely, 2^29031221 is an apocalyptic number.

It is an amenable number.

29031221 is a deficient number, since it is larger than the sum of its proper divisors (3900619).

29031221 is a wasteful number, since it uses less digits than its factorization.

29031221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2216.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 29031221 is about 5388.0628244296. The cubic root of 29031221 is about 307.3418968236.

The spelling of 29031221 in words is "twenty-nine million, thirty-one thousand, two hundred twenty-one".