3221020240 has 40 divisors (see below), whose sum is σ = 7493270400. Its totient is φ = 1287651456.

The previous prime is 3221020171. The next prime is 3221020241. The reversal of 3221020240 is 420201223.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3221020241) 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, 136861 + ... + 158659.

It is an arithmetic number, because the mean of its divisors is an integer number (187331760).

Almost surely, 2^3221020240 is an apocalyptic number.

It is an amenable number.

3221020240 is an abundant number, since it is smaller than the sum of its proper divisors (4272250160).

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

3221020240 is a wasteful number, since it uses less digits than its factorization.

3221020240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23659 (or 23653 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 3221020240 is about 56754.0328082507. The cubic root of 3221020240 is about 1476.8321944889.

Adding to 3221020240 its reverse (420201223), we get a palindrome (3641221463).

The spelling of 3221020240 in words is "three billion, two hundred twenty-one million, twenty thousand, two hundred forty".