2121804858 has 32 divisors (see below), whose sum is σ = 4487357952. Its totient is φ = 667756800.

The previous prime is 2121804847. The next prime is 2121804859. The reversal of 2121804858 is 8584081212.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (2121804859) 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 15 ways as a sum of consecutive naturals, for example, 131491 + ... + 146742.

It is an arithmetic number, because the mean of its divisors is an integer number (140229936).

Almost surely, 2^2121804858 is an apocalyptic number.

2121804858 is an abundant number, since it is smaller than the sum of its proper divisors (2365553094).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2121804858 is a wasteful number, since it uses less digits than its factorization.

2121804858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278310.

The product of its (nonzero) digits is 40960, while the sum is 39.

The square root of 2121804858 is about 46063.0530685928. The cubic root of 2121804858 is about 1284.9961105526.

The spelling of 2121804858 in words is "two billion, one hundred twenty-one million, eight hundred four thousand, eight hundred fifty-eight".