21221000022109 has 2 divisors, whose sum is σ = 21221000022110. Its totient is φ = 21221000022108.

The previous prime is 21221000022097. The next prime is 21221000022139. The reversal of 21221000022109 is 90122000012212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12739566978009 + 8481433044100 = 3569253^2 + 2912290^2 .

It is a cyclic number.

It is not a de Polignac number, because 21221000022109 - 2⁵ = 21221000022077 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21221000022109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21221000022139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610500011054 + 10610500011055.

It is an arithmetic number, because the mean of its divisors is an integer number (10610500011055).

Almost surely, 2^{21221000022109} is an apocalyptic number.

It is an amenable number.

21221000022109 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221000022109 is an equidigital number, since it uses as much as digits as its factorization.

21221000022109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 22.

The spelling of 21221000022109 in words is "twenty-one trillion, two hundred twenty-one billion, twenty-two thousand, one hundred nine".