129301221 has 8 divisors (see below), whose sum is σ = 197030464. Its totient is φ = 73886400.

The previous prime is 129301219. The next prime is 129301229. The reversal of 129301221 is 122103921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 129301221 - 2¹ = 129301219 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 6157201 = 129301221 / (1 + 2 + 9 + 3 + 0 + 1 + 2 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129301229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3078580 + ... + 3078621.

It is an arithmetic number, because the mean of its divisors is an integer number (24628808).

Almost surely, 2^129301221 is an apocalyptic number.

It is an amenable number.

129301221 is a deficient number, since it is larger than the sum of its proper divisors (67729243).

129301221 is an equidigital number, since it uses as much as digits as its factorization.

129301221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6157211.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 129301221 is about 11371.0694747680. The cubic root of 129301221 is about 505.6704111105.

The spelling of 129301221 in words is "one hundred twenty-nine million, three hundred one thousand, two hundred twenty-one".