3216723868521 has 12 divisors (see below), whose sum is σ = 4771956730372. Its totient is φ = 2086523590176.

The previous prime is 3216723868481. The next prime is 3216723868537. The reversal of 3216723868521 is 1258683276123.

3216723868521 is a `hidden beast` number, since 3 + 2 + 16 + 7 + 23 + 86 + 8 + 521 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1741133030400 + 1475590838121 = 1319520^2 + 1214739^2 .

It is not a de Polignac number, because 3216723868521 - 2¹⁴ = 3216723852137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3216723868591) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4829915386 + ... + 4829916051.

Almost surely, 2^{3216723868521} is an apocalyptic number.

It is an amenable number.

3216723868521 is a deficient number, since it is larger than the sum of its proper divisors (1555232861851).

3216723868521 is a wasteful number, since it uses less digits than its factorization.

3216723868521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9659831480 (or 9659831477 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 54.

The spelling of 3216723868521 in words is "three trillion, two hundred sixteen billion, seven hundred twenty-three million, eight hundred sixty-eight thousand, five hundred twenty-one".