29221139 has 4 divisors (see below), whose sum is σ = 29246256. Its totient is φ = 29196024.

The previous prime is 29221121. The next prime is 29221177. The reversal of 29221139 is 93112292.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 29221139 - 2¹² = 29217043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (29221039) 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, 10724 + ... + 13169.

It is an arithmetic number, because the mean of its divisors is an integer number (7311564).

Almost surely, 2^29221139 is an apocalyptic number.

29221139 is a deficient number, since it is larger than the sum of its proper divisors (25117).

29221139 is a wasteful number, since it uses less digits than its factorization.

29221139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25116.

The product of its digits is 1944, while the sum is 29.

The square root of 29221139 is about 5405.6580542983. The cubic root of 29221139 is about 308.0106359120.

The spelling of 29221139 in words is "twenty-nine million, two hundred twenty-one thousand, one hundred thirty-nine".