21001022211109 has 2 divisors, whose sum is σ = 21001022211110. Its totient is φ = 21001022211108.

The previous prime is 21001022211061. The next prime is 21001022211119. The reversal of 21001022211109 is 90111222010012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19773185357025 + 1227836854084 = 4446705^2 + 1108078^2 .

It is a cyclic number.

It is not a de Polignac number, because 21001022211109 - 2²⁷ = 21000887993381 is a prime.

It is a super-2 number, since 2×21001022211109² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21001022211109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21001022211119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500511105554 + 10500511105555.

It is an arithmetic number, because the mean of its divisors is an integer number (10500511105555).

Almost surely, 2^{21001022211109} is an apocalyptic number.

It is an amenable number.

21001022211109 is a deficient number, since it is larger than the sum of its proper divisors (1).

21001022211109 is an equidigital number, since it uses as much as digits as its factorization.

21001022211109 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 22.

The spelling of 21001022211109 in words is "twenty-one trillion, one billion, twenty-two million, two hundred eleven thousand, one hundred nine".