16532319221 has 4 divisors (see below), whose sum is σ = 18035257344. Its totient is φ = 15029381100.

The previous prime is 16532319191. The next prime is 16532319241. The reversal of 16532319221 is 12291323561.

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 16532319221 - 2⁶ = 16532319157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16532319241) 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, 751469045 + ... + 751469066.

It is an arithmetic number, because the mean of its divisors is an integer number (4508814336).

Almost surely, 2^16532319221 is an apocalyptic number.

16532319221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16532319221 is a deficient number, since it is larger than the sum of its proper divisors (1502938123).

16532319221 is a wasteful number, since it uses less digits than its factorization.

16532319221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1502938122.

The product of its digits is 19440, while the sum is 35.

The spelling of 16532319221 in words is "sixteen billion, five hundred thirty-two million, three hundred nineteen thousand, two hundred twenty-one".