2011521345 has 32 divisors (see below), whose sum is σ = 3525275520. Its totient is φ = 974883840.

The previous prime is 2011521341. The next prime is 2011521383. The reversal of 2011521345 is 5431251102.

It is a happy number.

It is not a de Polignac number, because 2011521345 - 2² = 2011521341 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2011521341) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 128611 + ... + 143400.

It is an arithmetic number, because the mean of its divisors is an integer number (110164860).

Almost surely, 2^2011521345 is an apocalyptic number.

It is an amenable number.

2011521345 is a deficient number, since it is larger than the sum of its proper divisors (1513754175).

2011521345 is a wasteful number, since it uses less digits than its factorization.

2011521345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272065.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 2011521345 is about 44849.9871237440. The cubic root of 2011521345 is about 1262.3357498964.

Adding to 2011521345 its reverse (5431251102), we get a palindrome (7442772447).

The spelling of 2011521345 in words is "two billion, eleven million, five hundred twenty-one thousand, three hundred forty-five".