21201273179 has 2 divisors, whose sum is σ = 21201273180. Its totient is φ = 21201273178.

The previous prime is 21201273169. The next prime is 21201273187. The reversal of 21201273179 is 97137210212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21201273179 - 2³² = 16906305883 is a prime.

It is not a weakly prime, because it can be changed into another prime (21201273169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600636589 + 10600636590.

It is an arithmetic number, because the mean of its divisors is an integer number (10600636590).

Almost surely, 2^21201273179 is an apocalyptic number.

21201273179 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201273179 is an equidigital number, since it uses as much as digits as its factorization.

21201273179 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10584, while the sum is 35.

The spelling of 21201273179 in words is "twenty-one billion, two hundred one million, two hundred seventy-three thousand, one hundred seventy-nine".