129703221 has 32 divisors (see below), whose sum is σ = 197683200. Its totient is φ = 84008880.

The previous prime is 129703207. The next prime is 129703247. The reversal of 129703221 is 122307921.

It is not a de Polignac number, because 129703221 - 2²² = 125508917 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129703121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 226866 + ... + 227436.

It is an arithmetic number, because the mean of its divisors is an integer number (6177600).

Almost surely, 2^129703221 is an apocalyptic number.

It is an amenable number.

129703221 is a deficient number, since it is larger than the sum of its proper divisors (67979979).

129703221 is a wasteful number, since it uses less digits than its factorization.

129703221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 806 (or 800 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 129703221 is about 11388.7321945860. The cubic root of 129703221 is about 506.1939153233.

The spelling of 129703221 in words is "one hundred twenty-nine million, seven hundred three thousand, two hundred twenty-one".