16722337221 has 8 divisors (see below), whose sum is σ = 24773832960. Its totient is φ = 11148224796.

The previous prime is 16722337207. The next prime is 16722337231. The reversal of 16722337221 is 12273322761.

16722337221 is a `hidden beast` number, since 1 + 67 + 223 + 372 + 2 + 1 = 666.

It is not a de Polignac number, because 16722337221 - 2¹⁸ = 16722075077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16722337231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 309672885 + ... + 309672938.

It is an arithmetic number, because the mean of its divisors is an integer number (3096729120).

Almost surely, 2^16722337221 is an apocalyptic number.

It is an amenable number.

16722337221 is a deficient number, since it is larger than the sum of its proper divisors (8051495739).

16722337221 is an equidigital number, since it uses as much as digits as its factorization.

16722337221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619345832 (or 619345826 counting only the distinct ones).

The product of its digits is 42336, while the sum is 36.

Adding to 16722337221 its reverse (12273322761), we get a palindrome (28995659982).

The spelling of 16722337221 in words is "sixteen billion, seven hundred twenty-two million, three hundred thirty-seven thousand, two hundred twenty-one".