29139421 has 4 divisors (see below), whose sum is σ = 29422432. Its totient is φ = 28856412.

The previous prime is 29139373. The next prime is 29139437. The reversal of 29139421 is 12493192.

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 29139421 - 2²¹ = 27042269 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 (29139491) 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, 141351 + ... + 141556.

It is an arithmetic number, because the mean of its divisors is an integer number (7355608).

Almost surely, 2^29139421 is an apocalyptic number.

It is an amenable number.

29139421 is a deficient number, since it is larger than the sum of its proper divisors (283011).

29139421 is a wasteful number, since it uses less digits than its factorization.

29139421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283010.

The product of its digits is 3888, while the sum is 31.

The square root of 29139421 is about 5398.0942007342. The cubic root of 29139421 is about 307.7232467879.

The spelling of 29139421 in words is "twenty-nine million, one hundred thirty-nine thousand, four hundred twenty-one".