29881421 has 2 divisors, whose sum is σ = 29881422. Its totient is φ = 29881420.

The previous prime is 29881417. The next prime is 29881429. The reversal of 29881421 is 12418892.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29311396 + 570025 = 5414^2 + 755^2 .

It is a cyclic number.

It is not a de Polignac number, because 29881421 - 2² = 29881417 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (29881429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14940710 + 14940711.

It is an arithmetic number, because the mean of its divisors is an integer number (14940711).

Almost surely, 2^29881421 is an apocalyptic number.

It is an amenable number.

29881421 is a deficient number, since it is larger than the sum of its proper divisors (1).

29881421 is an equidigital number, since it uses as much as digits as its factorization.

29881421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9216, while the sum is 35.

The square root of 29881421 is about 5466.3901251191. The cubic root of 29881421 is about 310.3133183235.

The spelling of 29881421 in words is "twenty-nine million, eight hundred eighty-one thousand, four hundred twenty-one".