21220221211109 has 4 divisors (see below), whose sum is σ = 21221401375980. Its totient is φ = 21219041046240.

The previous prime is 21220221211097. The next prime is 21220221211117. The reversal of 21220221211109 is 90111212202212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11080263662209 + 10139957548900 = 3328703^2 + 3184330^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21220221211109 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 (21220211211109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 590055464 + ... + 590091425.

It is an arithmetic number, because the mean of its divisors is an integer number (5305350343995).

Almost surely, 2^{21220221211109} is an apocalyptic number.

It is an amenable number.

21220221211109 is a deficient number, since it is larger than the sum of its proper divisors (1180164871).

21220221211109 is a wasteful number, since it uses less digits than its factorization.

21220221211109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1180164870.

The product of its (nonzero) digits is 576, while the sum is 26.

The spelling of 21220221211109 in words is "twenty-one trillion, two hundred twenty billion, two hundred twenty-one million, two hundred eleven thousand, one hundred nine".