21042006179 has 4 divisors (see below), whose sum is σ = 21168006384. Its totient is φ = 20916005976.

The previous prime is 21042006163. The next prime is 21042006187. The reversal of 21042006179 is 97160024012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21042006179 - 2⁴ = 21042006163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21042006149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62999852 + ... + 63000185.

It is an arithmetic number, because the mean of its divisors is an integer number (5292001596).

Almost surely, 2^21042006179 is an apocalyptic number.

21042006179 is a deficient number, since it is larger than the sum of its proper divisors (126000205).

21042006179 is a wasteful number, since it uses less digits than its factorization.

21042006179 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126000204.

The product of its (nonzero) digits is 6048, while the sum is 32.

The spelling of 21042006179 in words is "twenty-one billion, forty-two million, six thousand, one hundred seventy-nine".