2121211110 has 128 divisors (see below), whose sum is σ = 5744286720. Its totient is φ = 498617856.

The previous prime is 2121211109. The next prime is 2121211111. The reversal of 2121211110 is 111121212.

It is an interprime number because it is at equal distance from previous prime (2121211109) and next prime (2121211111).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121211111) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 482884 + ... + 487256.

It is an arithmetic number, because the mean of its divisors is an integer number (44877240).

Almost surely, 2^2121211110 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2121211110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2872143360).

2121211110 is an abundant number, since it is smaller than the sum of its proper divisors (3623075610).

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

2121211110 is a wasteful number, since it uses less digits than its factorization.

2121211110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4462.

The product of its (nonzero) digits is 8, while the sum is 12.

The square root of 2121211110 is about 46056.6076692585. The cubic root of 2121211110 is about 1284.8762385411.

Adding to 2121211110 its reverse (111121212), we get a palindrome (2232332322).

The spelling of 2121211110 in words is "two billion, one hundred twenty-one million, two hundred eleven thousand, one hundred ten".