129721270 has 16 divisors (see below), whose sum is σ = 266855328. Its totient is φ = 44475840.

The previous prime is 129721243. The next prime is 129721289. The reversal of 129721270 is 72127921.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 926511 + ... + 926650.

It is an arithmetic number, because the mean of its divisors is an integer number (16678458).

Almost surely, 2^129721270 is an apocalyptic number.

129721270 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129721270 is an abundant number, since it is smaller than the sum of its proper divisors (137134058).

129721270 is a wasteful number, since it uses less digits than its factorization.

129721270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1853175.

The product of its (nonzero) digits is 3528, while the sum is 31.

The square root of 129721270 is about 11389.5245730452. The cubic root of 129721270 is about 506.2173942319.

The spelling of 129721270 in words is "one hundred twenty-nine million, seven hundred twenty-one thousand, two hundred seventy".