3216012521 has 4 divisors (see below), whose sum is σ = 3261308544. Its totient is φ = 3170716500.

The previous prime is 3216012517. The next prime is 3216012539. The reversal of 3216012521 is 1252106123.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1252106123 = 1303 ⋅960941.

It is a cyclic number.

It is not a de Polignac number, because 3216012521 - 2² = 3216012517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3216012511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22647905 + ... + 22648046.

It is an arithmetic number, because the mean of its divisors is an integer number (815327136).

Almost surely, 2^3216012521 is an apocalyptic number.

It is an amenable number.

3216012521 is a deficient number, since it is larger than the sum of its proper divisors (45296023).

3216012521 is an equidigital number, since it uses as much as digits as its factorization.

3216012521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45296022.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 3216012521 is about 56709.8979103296. The cubic root of 3216012521 is about 1476.0664540270.

Adding to 3216012521 its reverse (1252106123), we get a palindrome (4468118644).

The spelling of 3216012521 in words is "three billion, two hundred sixteen million, twelve thousand, five hundred twenty-one".