3211661836321 has 27 divisors (see below), whose sum is σ = 3340743193713. Its totient is φ = 3087520515240.

The previous prime is 3211661836319. The next prime is 3211661836337. The reversal of 3211661836321 is 1236381661123.

The square root of 3211661836321 is 1792111.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 3211661836321 - 2¹ = 3211661836319 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3211661836421) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 5471314590 + ... + 5471315176.

Almost surely, 2^{3211661836321} is an apocalyptic number.

3211661836321 is the 1792111-st square number.

3211661836321 is the 896056-th centered octagonal number.

It is an amenable number.

3211661836321 is a deficient number, since it is larger than the sum of its proper divisors (129081357392).

3211661836321 is an frugal number, since it uses more digits than its factorization.

3211661836321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1402 (or 701 counting only the distinct ones).

The product of its digits is 186624, while the sum is 43.

The spelling of 3211661836321 in words is "three trillion, two hundred eleven billion, six hundred sixty-one million, eight hundred thirty-six thousand, three hundred twenty-one".