29993221 has 4 divisors (see below), whose sum is σ = 31027500. Its totient is φ = 28958944.

The previous prime is 29993167. The next prime is 29993233. The reversal of 29993221 is 12239992.

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 13068225 + 16924996 = 3615^2 + 4114^2 .

It is a cyclic number.

It is not a de Polignac number, because 29993221 - 2¹¹ = 29991173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29993261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 517096 + ... + 517153.

It is an arithmetic number, because the mean of its divisors is an integer number (7756875).

Almost surely, 2^29993221 is an apocalyptic number.

It is an amenable number.

29993221 is a deficient number, since it is larger than the sum of its proper divisors (1034279).

29993221 is a wasteful number, since it uses less digits than its factorization.

29993221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1034278.

The product of its digits is 17496, while the sum is 37.

The square root of 29993221 is about 5476.6067048858. The cubic root of 29993221 is about 310.6998444666.

The spelling of 29993221 in words is "twenty-nine million, nine hundred ninety-three thousand, two hundred twenty-one".