3221615420 has 24 divisors (see below), whose sum is σ = 6810804000. Its totient is φ = 1279996352.

The previous prime is 3221615401. The next prime is 3221615429. The reversal of 3221615420 is 245161223.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 3221615420.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3221615429) 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, 537560 + ... + 543519.

It is an arithmetic number, because the mean of its divisors is an integer number (283783500).

Almost surely, 2^3221615420 is an apocalyptic number.

It is an amenable number.

3221615420 is an abundant number, since it is smaller than the sum of its proper divisors (3589188580).

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

3221615420 is a wasteful number, since it uses less digits than its factorization.

3221615420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1081237 (or 1081235 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 3221615420 is about 56759.2760700839. The cubic root of 3221615420 is about 1476.9231518861.

Adding to 3221615420 its reverse (245161223), we get a palindrome (3466776643).

The spelling of 3221615420 in words is "three billion, two hundred twenty-one million, six hundred fifteen thousand, four hundred twenty".