29140721 has 4 divisors (see below), whose sum is σ = 29157744. Its totient is φ = 29123700.

The previous prime is 29140691. The next prime is 29140723. The reversal of 29140721 is 12704192.

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 not a de Polignac number, because 29140721 - 2¹⁰ = 29139697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (29140723) 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, 5615 + ... + 9476.

It is an arithmetic number, because the mean of its divisors is an integer number (7289436).

Almost surely, 2^29140721 is an apocalyptic number.

It is an amenable number.

29140721 is a deficient number, since it is larger than the sum of its proper divisors (17023).

29140721 is a wasteful number, since it uses less digits than its factorization.

29140721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17022.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 29140721 is about 5398.2146122584. The cubic root of 29140721 is about 307.7278228829.

The spelling of 29140721 in words is "twenty-nine million, one hundred forty thousand, seven hundred twenty-one".