2129232109 has 4 divisors (see below), whose sum is σ = 2137147740. Its totient is φ = 2121316480.

The previous prime is 2129232101. The next prime is 2129232137. The reversal of 2129232109 is 9012329212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 793548900 + 1335683209 = 28170^2 + 36547^2 .

It is a cyclic number.

It is not a de Polignac number, because 2129232109 - 2³ = 2129232101 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2129232101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3957412 + ... + 3957949.

It is an arithmetic number, because the mean of its divisors is an integer number (534286935).

Almost surely, 2^2129232109 is an apocalyptic number.

It is an amenable number.

2129232109 is a deficient number, since it is larger than the sum of its proper divisors (7915631).

2129232109 is an equidigital number, since it uses as much as digits as its factorization.

2129232109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7915630.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 2129232109 is about 46143.6031211261. The cubic root of 2129232109 is about 1286.4937151608.

The spelling of 2129232109 in words is "two billion, one hundred twenty-nine million, two hundred thirty-two thousand, one hundred nine".