29028221 has 2 divisors, whose sum is σ = 29028222. Its totient is φ = 29028220.

The previous prime is 29028203. The next prime is 29028227. The reversal of 29028221 is 12282092.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26925721 + 2102500 = 5189^2 + 1450^2 .

It is a cyclic number.

It is not a de Polignac number, because 29028221 - 2¹⁰ = 29027197 is a prime.

It is a super-2 number, since 2×29028221² = 1685275228849682, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (29028227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14514110 + 14514111.

It is an arithmetic number, because the mean of its divisors is an integer number (14514111).

Almost surely, 2^29028221 is an apocalyptic number.

It is an amenable number.

29028221 is a deficient number, since it is larger than the sum of its proper divisors (1).

29028221 is an equidigital number, since it uses as much as digits as its factorization.

29028221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 29028221 is about 5387.7844240467. The cubic root of 29028221 is about 307.3313098598.

The spelling of 29028221 in words is "twenty-nine million, twenty-eight thousand, two hundred twenty-one".