29930921 has 2 divisors, whose sum is σ = 29930922. Its totient is φ = 29930920.

The previous prime is 29930899. The next prime is 29930933. The reversal of 29930921 is 12903992.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29855296 + 75625 = 5464^2 + 275^2 .

It is a cyclic number.

It is not a de Polignac number, because 29930921 - 2¹⁸ = 29668777 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is equal to p_1853783 and since 29930921 and 1853783 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (29930821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14965460 + 14965461.

It is an arithmetic number, because the mean of its divisors is an integer number (14965461).

Almost surely, 2^29930921 is an apocalyptic number.

It is an amenable number.

29930921 is a deficient number, since it is larger than the sum of its proper divisors (1).

29930921 is an equidigital number, since it uses as much as digits as its factorization.

29930921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 29930921 is about 5470.9159196610. The cubic root of 29930921 is about 310.4845734014.

The spelling of 29930921 in words is "twenty-nine million, nine hundred thirty thousand, nine hundred twenty-one".