21101211179 has 2 divisors, whose sum is σ = 21101211180. Its totient is φ = 21101211178.

The previous prime is 21101211091. The next prime is 21101211191. The reversal of 21101211179 is 97111210112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21101211179 is a prime.

It is a super-2 number, since 2×21101211179² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21101216179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550605589 + 10550605590.

It is an arithmetic number, because the mean of its divisors is an integer number (10550605590).

Almost surely, 2^21101211179 is an apocalyptic number.

21101211179 is a deficient number, since it is larger than the sum of its proper divisors (1).

21101211179 is an equidigital number, since it uses as much as digits as its factorization.

21101211179 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 252, while the sum is 26.

The spelling of 21101211179 in words is "twenty-one billion, one hundred one million, two hundred eleven thousand, one hundred seventy-nine".