2011321345 has 16 divisors (see below), whose sum is σ = 2694238272. Its totient is φ = 1428759360.

The previous prime is 2011321343. The next prime is 2011321381. The reversal of 2011321345 is 5431231102.

It is a happy number.

It is not a de Polignac number, because 2011321345 - 2¹ = 2011321343 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2011321343) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 422862 + ... + 427591.

It is an arithmetic number, because the mean of its divisors is an integer number (168389892).

Almost surely, 2^2011321345 is an apocalyptic number.

It is an amenable number.

2011321345 is a deficient number, since it is larger than the sum of its proper divisors (682916927).

2011321345 is a wasteful number, since it uses less digits than its factorization.

2011321345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 850512.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 2011321345 is about 44847.7574132754. The cubic root of 2011321345 is about 1262.2939116598.

Adding to 2011321345 its reverse (5431231102), we get a palindrome (7442552447).

The spelling of 2011321345 in words is "two billion, eleven million, three hundred twenty-one thousand, three hundred forty-five".