129121342 has 24 divisors (see below), whose sum is σ = 227528784. Its totient is φ = 53834112.

The previous prime is 129121339. The next prime is 129121351. The reversal of 129121342 is 243121921.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15798 + ... + 22534.

It is an arithmetic number, because the mean of its divisors is an integer number (9480366).

Almost surely, 2^129121342 is an apocalyptic number.

129121342 is a deficient number, since it is larger than the sum of its proper divisors (98407442).

129121342 is an equidigital number, since it uses as much as digits as its factorization.

129121342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6820 (or 6783 counting only the distinct ones).

The product of its digits is 864, while the sum is 25.

The square root of 129121342 is about 11363.1572197167. The cubic root of 129121342 is about 505.4358123969.

The spelling of 129121342 in words is "one hundred twenty-nine million, one hundred twenty-one thousand, three hundred forty-two".