2121312210 has 32 divisors (see below), whose sum is σ = 5174615232. Its totient is φ = 556409280.

The previous prime is 2121312143. The next prime is 2121312233. The reversal of 2121312210 is 122131212.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 2121312210.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 577764 + ... + 581423.

It is an arithmetic number, because the mean of its divisors is an integer number (161706726).

Almost surely, 2^2121312210 is an apocalyptic number.

2121312210 is an abundant number, since it is smaller than the sum of its proper divisors (3053303022).

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

2121312210 is a wasteful number, since it uses less digits than its factorization.

2121312210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1159258.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 2121312210 is about 46057.7052185625. The cubic root of 2121312210 is about 1284.8966512389.

Adding to 2121312210 its reverse (122131212), we get a palindrome (2243443422).

The spelling of 2121312210 in words is "two billion, one hundred twenty-one million, three hundred twelve thousand, two hundred ten".