21122120179 has 2 divisors, whose sum is σ = 21122120180. Its totient is φ = 21122120178.

The previous prime is 21122120143. The next prime is 21122120197. The reversal of 21122120179 is 97102122112.

Together with next prime (21122120197) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21122120179 - 2¹¹ = 21122118131 is a prime.

It is a super-2 number, since 2×21122120179² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21122120119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10561060089 + 10561060090.

It is an arithmetic number, because the mean of its divisors is an integer number (10561060090).

Almost surely, 2^21122120179 is an apocalyptic number.

21122120179 is a deficient number, since it is larger than the sum of its proper divisors (1).

21122120179 is an equidigital number, since it uses as much as digits as its factorization.

21122120179 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 28.

The spelling of 21122120179 in words is "twenty-one billion, one hundred twenty-two million, one hundred twenty thousand, one hundred seventy-nine".