21201222102091 has 2 divisors, whose sum is σ = 21201222102092. Its totient is φ = 21201222102090.

The previous prime is 21201222102029. The next prime is 21201222102197. The reversal of 21201222102091 is 19020122210212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21201222102091 - 2⁷ = 21201222101963 is a prime.

It is a super-3 number, since 3×21201222102091³ (a number of 41 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (21201222102391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600611051045 + 10600611051046.

It is an arithmetic number, because the mean of its divisors is an integer number (10600611051046).

Almost surely, 2^{21201222102091} is an apocalyptic number.

21201222102091 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201222102091 is an equidigital number, since it uses as much as digits as its factorization.

21201222102091 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 21201222102091 in words is "twenty-one trillion, two hundred one billion, two hundred twenty-two million, one hundred two thousand, ninety-one".