21202210111109 has 2 divisors, whose sum is σ = 21202210111110. Its totient is φ = 21202210111108.

The previous prime is 21202210111073. The next prime is 21202210111177. The reversal of 21202210111109 is 90111101220212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21184129274884 + 18080836225 = 4602622^2 + 134465^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21202210111109 is a prime.

It is a super-2 number, since 2×21202210111109² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21202210111609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601105055554 + 10601105055555.

It is an arithmetic number, because the mean of its divisors is an integer number (10601105055555).

Almost surely, 2^{21202210111109} is an apocalyptic number.

It is an amenable number.

21202210111109 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202210111109 is an equidigital number, since it uses as much as digits as its factorization.

21202210111109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 23.

The spelling of 21202210111109 in words is "twenty-one trillion, two hundred two billion, two hundred ten million, one hundred eleven thousand, one hundred nine".