21222166446065 has 48 divisors (see below), whose sum is σ = 27677079646272. Its totient is φ = 15614482920192.

The previous prime is 21222166446001. The next prime is 21222166446077. The reversal of 21222166446065 is 56064466122212.

It is a happy number.

It is not a de Polignac number, because 21222166446065 - 2⁶ = 21222166446001 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1407018014 + ... + 1407033096.

It is an arithmetic number, because the mean of its divisors is an integer number (576605825964).

Almost surely, 2^{21222166446065} is an apocalyptic number.

It is an amenable number.

21222166446065 is a deficient number, since it is larger than the sum of its proper divisors (6454913200207).

21222166446065 is a wasteful number, since it uses less digits than its factorization.

21222166446065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21090 (or 21077 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 47.

The spelling of 21222166446065 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred sixty-six million, four hundred forty-six thousand, sixty-five".