2129690085 has 64 divisors (see below), whose sum is σ = 3564601344. Its totient is φ = 1085011200.

The previous prime is 2129690063. The next prime is 2129690089. The reversal of 2129690085 is 5800969212.

It is not a de Polignac number, because 2129690085 - 2⁶ = 2129690021 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2129690089) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7858500 + ... + 7858770.

It is an arithmetic number, because the mean of its divisors is an integer number (55696896).

Almost surely, 2^2129690085 is an apocalyptic number.

It is an amenable number.

2129690085 is a deficient number, since it is larger than the sum of its proper divisors (1434911259).

2129690085 is a wasteful number, since it uses less digits than its factorization.

2129690085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554.

The product of its (nonzero) digits is 77760, while the sum is 42.

The square root of 2129690085 is about 46148.5653623165. The cubic root of 2129690085 is about 1286.5859457519.

The spelling of 2129690085 in words is "two billion, one hundred twenty-nine million, six hundred ninety thousand, eighty-five".