21201222211079 has 2 divisors, whose sum is σ = 21201222211080. Its totient is φ = 21201222211078.

The previous prime is 21201222211069. The next prime is 21201222211097. The reversal of 21201222211079 is 97011222210212.

Together with next prime (21201222211097) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21201222211079 - 2⁴ = 21201222211063 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21201222211069) 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, 10600611105539 + 10600611105540.

It is an arithmetic number, because the mean of its divisors is an integer number (10600611105540).

Almost surely, 2^{21201222211079} is an apocalyptic number.

21201222211079 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201222211079 is an equidigital number, since it uses as much as digits as its factorization.

21201222211079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 32.

The spelling of 21201222211079 in words is "twenty-one trillion, two hundred one billion, two hundred twenty-two million, two hundred eleven thousand, seventy-nine".