16722037221 has 16 divisors (see below), whose sum is σ = 22615211520. Its totient is φ = 10988515440.

The previous prime is 16722037169. The next prime is 16722037229. The reversal of 16722037221 is 12273022761.

It is not a de Polignac number, because 16722037221 - 2²² = 16717842917 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16722037229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1691190 + ... + 1701048.

It is an arithmetic number, because the mean of its divisors is an integer number (1413450720).

Almost surely, 2^16722037221 is an apocalyptic number.

It is an amenable number.

16722037221 is a deficient number, since it is larger than the sum of its proper divisors (5893174299).

16722037221 is an equidigital number, since it uses as much as digits as its factorization.

16722037221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17896.

The product of its (nonzero) digits is 14112, while the sum is 33.

Adding to 16722037221 its reverse (12273022761), we get a palindrome (28995059982).

The spelling of 16722037221 in words is "sixteen billion, seven hundred twenty-two million, thirty-seven thousand, two hundred twenty-one".