190421395129 has 81 divisors (see below), whose sum is σ = 249636936717. Its totient is φ = 144778088448.

The previous prime is 190421395123. The next prime is 190421395133. The reversal of 190421395129 is 921593124091.

The square root of 190421395129 is 436373.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 116057529 + 190305337600 = 10773^2 + 436240^2 .

It is not a de Polignac number, because 190421395129 - 2¹¹ = 190421393081 is a prime.

It is not an unprimeable number, because it can be changed into a prime (190421395123) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 986639257 + ... + 986639449.

Almost surely, 2^190421395129 is an apocalyptic number.

190421395129 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

190421395129 is the 436373-rd square number.

190421395129 is the 218187-th centered octagonal number.

It is an amenable number.

190421395129 is a deficient number, since it is larger than the sum of its proper divisors (59215541588).

190421395129 is an equidigital number, since it uses as much as digits as its factorization.

190421395129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472 (or 236 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 46.

The spelling of 190421395129 in words is "one hundred ninety billion, four hundred twenty-one million, three hundred ninety-five thousand, one hundred twenty-nine".