2121865234 has 16 divisors (see below), whose sum is σ = 3377721600. Its totient is φ = 996243264.

The previous prime is 2121865201. The next prime is 2121865259. The reversal of 2121865234 is 4325681212.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a self number, because there is not a number n which added to its sum of digits gives 2121865234.

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, 56154 + ... + 86005.

It is an arithmetic number, because the mean of its divisors is an integer number (211107600).

Almost surely, 2^2121865234 is an apocalyptic number.

2121865234 is a deficient number, since it is larger than the sum of its proper divisors (1255856366).

2121865234 is a wasteful number, since it uses less digits than its factorization.

2121865234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142617.

The product of its digits is 23040, while the sum is 34.

The square root of 2121865234 is about 46063.7084264826. The cubic root of 2121865234 is about 1285.0082986337.

The spelling of 2121865234 in words is "two billion, one hundred twenty-one million, eight hundred sixty-five thousand, two hundred thirty-four".