3221120528261 has 16 divisors (see below), whose sum is σ = 3492606230784. Its totient is φ = 2958855588864.

The previous prime is 3221120528257. The next prime is 3221120528273. The reversal of 3221120528261 is 1628250211223.

It is a cyclic number.

It is not a de Polignac number, because 3221120528261 - 2² = 3221120528257 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3221120528251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 750605 + ... + 2646818.

It is an arithmetic number, because the mean of its divisors is an integer number (218287889424).

Almost surely, 2^{3221120528261} is an apocalyptic number.

It is an amenable number.

3221120528261 is a deficient number, since it is larger than the sum of its proper divisors (271485702523).

3221120528261 is a wasteful number, since it uses less digits than its factorization.

3221120528261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3398780.

The product of its (nonzero) digits is 23040, while the sum is 35.

Adding to 3221120528261 its reverse (1628250211223), we get a palindrome (4849370739484).

The spelling of 3221120528261 in words is "three trillion, two hundred twenty-one billion, one hundred twenty million, five hundred twenty-eight thousand, two hundred sixty-one".