2106720330 has 128 divisors (see below), whose sum is σ = 5957038080. Its totient is φ = 470088960.

The previous prime is 2106720311. The next prime is 2106720349. The reversal of 2106720330 is 330276012.

It is an interprime number because it is at equal distance from previous prime (2106720311) and next prime (2106720349).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2106720330.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2929711 + ... + 2930429.

It is an arithmetic number, because the mean of its divisors is an integer number (46539360).

Almost surely, 2^2106720330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2106720330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2978519040).

2106720330 is an abundant number, since it is smaller than the sum of its proper divisors (3850317750).

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

2106720330 is a wasteful number, since it uses less digits than its factorization.

2106720330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1436.

The product of its (nonzero) digits is 1512, while the sum is 24.

The square root of 2106720330 is about 45899.0231922206. The cubic root of 2106720330 is about 1281.9437286023.

Adding to 2106720330 its reverse (330276012), we get a palindrome (2436996342).

The spelling of 2106720330 in words is "two billion, one hundred six million, seven hundred twenty thousand, three hundred thirty".