21121098179 has 2 divisors, whose sum is σ = 21121098180. Its totient is φ = 21121098178.

The previous prime is 21121098161. The next prime is 21121098203. The reversal of 21121098179 is 97189012112.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21121098179 is a prime.

It is a super-2 number, since 2×21121098179² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21121098139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560549089 + 10560549090.

It is an arithmetic number, because the mean of its divisors is an integer number (10560549090).

Almost surely, 2^21121098179 is an apocalyptic number.

21121098179 is a deficient number, since it is larger than the sum of its proper divisors (1).

21121098179 is an equidigital number, since it uses as much as digits as its factorization.

21121098179 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 41.

The spelling of 21121098179 in words is "twenty-one billion, one hundred twenty-one million, ninety-eight thousand, one hundred seventy-nine".