129012022 has 4 divisors (see below), whose sum is σ = 193518036. Its totient is φ = 64506010.

The previous prime is 129011999. The next prime is 129012029. The reversal of 129012022 is 220210921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 220210921 = 7 ⋅31458703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129012029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32253004 + ... + 32253007.

It is an arithmetic number, because the mean of its divisors is an integer number (48379509).

Almost surely, 2^129012022 is an apocalyptic number.

129012022 is a deficient number, since it is larger than the sum of its proper divisors (64506014).

129012022 is an equidigital number, since it uses as much as digits as its factorization.

129012022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64506013.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 129012022 is about 11358.3459183105. The cubic root of 129012022 is about 505.2931304744.

Adding to 129012022 its reverse (220210921), we get a palindrome (349222943).

The spelling of 129012022 in words is "one hundred twenty-nine million, twelve thousand, twenty-two".