3221721037764 has 36 divisors (see below), whose sum is σ = 8155895642076. Its totient is φ = 1072311303168.

The previous prime is 3221721037729. The next prime is 3221721037789. The reversal of 3221721037764 is 4677301271223.

3221721037764 is a `hidden beast` number, since 3 + 2 + 2 + 1 + 7 + 210 + 377 + 64 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 553536000000 + 2668185037764 = 744000^2 + 1633458^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×3221721037764² (a number of 26 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66463329 + ... + 66511784.

Almost surely, 2^{3221721037764} is an apocalyptic number.

It is an amenable number.

3221721037764 is an abundant number, since it is smaller than the sum of its proper divisors (4934174604312).

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

3221721037764 is a wasteful number, since it uses less digits than its factorization.

3221721037764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132975796 (or 132975791 counting only the distinct ones).

The product of its (nonzero) digits is 592704, while the sum is 45.

The spelling of 3221721037764 in words is "three trillion, two hundred twenty-one billion, seven hundred twenty-one million, thirty-seven thousand, seven hundred sixty-four".