3221251540 has 144 divisors (see below), whose sum is σ = 7685508096. Its totient is φ = 1132185600.

The previous prime is 3221251519. The next prime is 3221251541. The reversal of 3221251540 is 451521223.

It is a super-2 number, since 2×3221251540² = 20752922967904743200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3221251541) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7439164 + ... + 7439596.

It is an arithmetic number, because the mean of its divisors is an integer number (53371584).

Almost surely, 2^3221251540 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 3221251540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3842754048).

3221251540 is an abundant number, since it is smaller than the sum of its proper divisors (4464256556).

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

3221251540 is a wasteful number, since it uses less digits than its factorization.

3221251540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 570 (or 555 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 3221251540 is about 56756.0705123249. The cubic root of 3221251540 is about 1476.8675438591.

Adding to 3221251540 its reverse (451521223), we get a palindrome (3672772763).

The spelling of 3221251540 in words is "three billion, two hundred twenty-one million, two hundred fifty-one thousand, five hundred forty".