21013013167 has 2 divisors, whose sum is σ = 21013013168. Its totient is φ = 21013013166.

The previous prime is 21013013143. The next prime is 21013013209. The reversal of 21013013167 is 76131031012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21013013167 - 2⁷ = 21013013039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21013013107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506506583 + 10506506584.

It is an arithmetic number, because the mean of its divisors is an integer number (10506506584).

Almost surely, 2^21013013167 is an apocalyptic number.

21013013167 is a deficient number, since it is larger than the sum of its proper divisors (1).

21013013167 is an equidigital number, since it uses as much as digits as its factorization.

21013013167 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756, while the sum is 25.

Adding to 21013013167 its reverse (76131031012), we get a palindrome (97144044179).

The spelling of 21013013167 in words is "twenty-one billion, thirteen million, thirteen thousand, one hundred sixty-seven".