29920421 has 8 divisors (see below), whose sum is σ = 31876320. Its totient is φ = 28002672.

The previous prime is 29920417. The next prime is 29920427. The reversal of 29920421 is 12402992.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 29920421 - 2² = 29920417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29920427) 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 7 ways as a sum of consecutive naturals, for example, 7910 + ... + 11063.

It is an arithmetic number, because the mean of its divisors is an integer number (3984540).

Almost surely, 2^29920421 is an apocalyptic number.

It is an amenable number.

29920421 is a deficient number, since it is larger than the sum of its proper divisors (1955899).

29920421 is a wasteful number, since it uses less digits than its factorization.

29920421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19075.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 29920421 is about 5469.9562155469. The cubic root of 29920421 is about 310.4482623536.

The spelling of 29920421 in words is "twenty-nine million, nine hundred twenty thousand, four hundred twenty-one".