3221520012 has 72 divisors (see below), whose sum is σ = 8454264000. Its totient is φ = 1072648656.

The previous prime is 3221520011. The next prime is 3221520079. The reversal of 3221520012 is 2100251223.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (3221520011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1533739 + ... + 1535837.

Almost surely, 2^3221520012 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3221520012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4227132000).

3221520012 is an abundant number, since it is smaller than the sum of its proper divisors (5232743988).

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

3221520012 is a wasteful number, since it uses less digits than its factorization.

3221520012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3697 (or 3683 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 3221520012 is about 56758.4356021200. The cubic root of 3221520012 is about 1476.9085720706.

Adding to 3221520012 its reverse (2100251223), we get a palindrome (5321771235).

The spelling of 3221520012 in words is "three billion, two hundred twenty-one million, five hundred twenty thousand, twelve".