2121010129 has 8 divisors (see below), whose sum is σ = 2473481600. Its totient is φ = 1818008388.

The previous prime is 2121010123. The next prime is 2121010189. The reversal of 2121010129 is 9210101212.

It is a happy number.

It is not a de Polignac number, because 2121010129 - 2¹³ = 2121001937 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121010123) 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 7 ways as a sum of consecutive naturals, for example, 3091509 + ... + 3092194.

It is an arithmetic number, because the mean of its divisors is an integer number (309185200).

Almost surely, 2^2121010129 is an apocalyptic number.

It is an amenable number.

2121010129 is a deficient number, since it is larger than the sum of its proper divisors (352471471).

2121010129 is an frugal number, since it uses more digits than its factorization.

2121010129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6183724 (or 6183710 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 2121010129 is about 46054.4257265249. The cubic root of 2121010129 is about 1284.8356573426.

The spelling of 2121010129 in words is "two billion, one hundred twenty-one million, ten thousand, one hundred twenty-nine".