16211546221 has 12 divisors (see below), whose sum is σ = 17558759232. Its totient is φ = 14960886096.

The previous prime is 16211546203. The next prime is 16211546237. The reversal of 16211546221 is 12264511261.

It is a happy number.

It is not a de Polignac number, because 16211546221 - 2⁹ = 16211545709 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 (16211546201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 901500 + ... + 919306.

It is an arithmetic number, because the mean of its divisors is an integer number (1463229936).

Almost surely, 2^16211546221 is an apocalyptic number.

It is an amenable number.

16211546221 is a deficient number, since it is larger than the sum of its proper divisors (1347213011).

16211546221 is a wasteful number, since it uses less digits than its factorization.

16211546221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23220 (or 23207 counting only the distinct ones).

The product of its digits is 5760, while the sum is 31.

The spelling of 16211546221 in words is "sixteen billion, two hundred eleven million, five hundred forty-six thousand, two hundred twenty-one".