21001532179 has 2 divisors, whose sum is σ = 21001532180. Its totient is φ = 21001532178.

The previous prime is 21001532099. The next prime is 21001532191. The reversal of 21001532179 is 97123510012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21001532179 - 2⁷ = 21001532051 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21001532179.

It is not a weakly prime, because it can be changed into another prime (21001532479) 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, 10500766089 + 10500766090.

It is an arithmetic number, because the mean of its divisors is an integer number (10500766090).

Almost surely, 2^21001532179 is an apocalyptic number.

21001532179 is a deficient number, since it is larger than the sum of its proper divisors (1).

21001532179 is an equidigital number, since it uses as much as digits as its factorization.

21001532179 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3780, while the sum is 31.

The spelling of 21001532179 in words is "twenty-one billion, one million, five hundred thirty-two thousand, one hundred seventy-nine".