16969720321 has 4 divisors (see below), whose sum is σ = 17707534272. Its totient is φ = 16231906372.

The previous prime is 16969720277. The next prime is 16969720349. The reversal of 16969720321 is 12302796961.

It is a happy number.

16969720321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 16969720321 - 2²³ = 16961331713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16969720351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 368906941 + ... + 368906986.

It is an arithmetic number, because the mean of its divisors is an integer number (4426883568).

Almost surely, 2^16969720321 is an apocalyptic number.

It is an amenable number.

16969720321 is a deficient number, since it is larger than the sum of its proper divisors (737813951).

16969720321 is an equidigital number, since it uses as much as digits as its factorization.

16969720321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 737813950.

The product of its (nonzero) digits is 244944, while the sum is 46.

The spelling of 16969720321 in words is "sixteen billion, nine hundred sixty-nine million, seven hundred twenty thousand, three hundred twenty-one".