21222021010109 has 2 divisors, whose sum is σ = 21222021010110. Its totient is φ = 21222021010108.

The previous prime is 21222021010093. The next prime is 21222021010129. The reversal of 21222021010109 is 90101012022212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10872912708100 + 10349108302009 = 3297410^2 + 3217003^2 .

It is a cyclic number.

It is not a de Polignac number, because 21222021010109 - 2⁴ = 21222021010093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21222021010129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611010505054 + 10611010505055.

It is an arithmetic number, because the mean of its divisors is an integer number (10611010505055).

Almost surely, 2^{21222021010109} is an apocalyptic number.

It is an amenable number.

21222021010109 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222021010109 is an equidigital number, since it uses as much as digits as its factorization.

21222021010109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 23.

The spelling of 21222021010109 in words is "twenty-one trillion, two hundred twenty-two billion, twenty-one million, ten thousand, one hundred nine".