16501421222 has 64 divisors (see below), whose sum is σ = 29804217408. Its totient is φ = 6809299200.

The previous prime is 16501421221. The next prime is 16501421227. The reversal of 16501421222 is 22212410561.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a junction number, because it is equal to n+sod(n) for n = 16501421191 and 16501421200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16501421221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2107058 + ... + 2114874.

It is an arithmetic number, because the mean of its divisors is an integer number (465690897).

Almost surely, 2^16501421222 is an apocalyptic number.

16501421222 is a deficient number, since it is larger than the sum of its proper divisors (13302796186).

16501421222 is a wasteful number, since it uses less digits than its factorization.

16501421222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7926 (or 7904 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

Adding to 16501421222 its reverse (22212410561), we get a palindrome (38713831783).

The spelling of 16501421222 in words is "sixteen billion, five hundred one million, four hundred twenty-one thousand, two hundred twenty-two".