21220332212109 has 32 divisors (see below), whose sum is σ = 30810487795200. Its totient is φ = 12939927698880.

The previous prime is 21220332212077. The next prime is 21220332212113. The reversal of 21220332212109 is 90121223302212.

It is not a de Polignac number, because 21220332212109 - 2⁵ = 21220332212077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220332212129) 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, 139045174 + ... + 139197704.

It is an arithmetic number, because the mean of its divisors is an integer number (962827743600).

Almost surely, 2^{21220332212109} is an apocalyptic number.

21220332212109 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

21220332212109 is a deficient number, since it is larger than the sum of its proper divisors (9590155583091).

21220332212109 is a wasteful number, since it uses less digits than its factorization.

21220332212109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236745.

The product of its (nonzero) digits is 5184, while the sum is 30.

The spelling of 21220332212109 in words is "twenty-one trillion, two hundred twenty billion, three hundred thirty-two million, two hundred twelve thousand, one hundred nine".