29716421 has 4 divisors (see below), whose sum is σ = 33961632. Its totient is φ = 25471212.

The previous prime is 29716381. The next prime is 29716429. The reversal of 29716421 is 12461792.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-29716421 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 (29716429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2122595 + ... + 2122608.

It is an arithmetic number, because the mean of its divisors is an integer number (8490408).

Almost surely, 2^29716421 is an apocalyptic number.

It is an amenable number.

29716421 is a deficient number, since it is larger than the sum of its proper divisors (4245211).

29716421 is an equidigital number, since it uses as much as digits as its factorization.

29716421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4245210.

The product of its digits is 6048, while the sum is 32.

The square root of 29716421 is about 5451.2770063536. The cubic root of 29716421 is about 309.7410984372.

The spelling of 29716421 in words is "twenty-nine million, seven hundred sixteen thousand, four hundred twenty-one".