21222021201091 has 2 divisors, whose sum is σ = 21222021201092. Its totient is φ = 21222021201090.

The previous prime is 21222021201079. The next prime is 21222021201137. The reversal of 21222021201091 is 19010212022212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21222021201091 - 2²¹ = 21222019103939 is a prime.

It is not a weakly prime, because it can be changed into another prime (21222021201071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611010600545 + 10611010600546.

It is an arithmetic number, because the mean of its divisors is an integer number (10611010600546).

Almost surely, 2^{21222021201091} is an apocalyptic number.

21222021201091 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222021201091 is an equidigital number, since it uses as much as digits as its factorization.

21222021201091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 25.

The spelling of 21222021201091 in words is "twenty-one trillion, two hundred twenty-two billion, twenty-one million, two hundred one thousand, ninety-one".