16752806921 has 4 divisors (see below), whose sum is σ = 16840518144. Its totient is φ = 16665095700.

The previous prime is 16752806867. The next prime is 16752806929. The reversal of 16752806921 is 12960825761.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 16752806921 - 2⁶ = 16752806857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16752806929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43855325 + ... + 43855706.

It is an arithmetic number, because the mean of its divisors is an integer number (4210129536).

Almost surely, 2^16752806921 is an apocalyptic number.

It is an amenable number.

16752806921 is a deficient number, since it is larger than the sum of its proper divisors (87711223).

16752806921 is an equidigital number, since it uses as much as digits as its factorization.

16752806921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87711222.

The product of its (nonzero) digits is 362880, while the sum is 47.

The spelling of 16752806921 in words is "sixteen billion, seven hundred fifty-two million, eight hundred six thousand, nine hundred twenty-one".