4005521212 has 24 divisors (see below), whose sum is σ = 8739319680. Its totient is φ = 1560592560.

The previous prime is 4005521207. The next prime is 4005521213. The reversal of 4005521212 is 2121255004.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4005521213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6502162 + ... + 6502777.

It is an arithmetic number, because the mean of its divisors is an integer number (364138320).

Almost surely, 2^4005521212 is an apocalyptic number.

It is an amenable number.

4005521212 is an abundant number, since it is smaller than the sum of its proper divisors (4733798468).

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

4005521212 is a wasteful number, since it uses less digits than its factorization.

4005521212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13004961 (or 13004959 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 4005521212 is about 63289.1871649494. The cubic root of 4005521212 is about 1588.1310809955.

Adding to 4005521212 its reverse (2121255004), we get a palindrome (6126776216).

The spelling of 4005521212 in words is "four billion, five million, five hundred twenty-one thousand, two hundred twelve".