21018134167 has 2 divisors, whose sum is σ = 21018134168. Its totient is φ = 21018134166.

The previous prime is 21018134119. The next prime is 21018134201. The reversal of 21018134167 is 76143181012.

It is an a-pointer prime, because the next prime (21018134201) can be obtained adding 21018134167 to its sum of digits (34).

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21018134167 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21018134867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10509067083 + 10509067084.

It is an arithmetic number, because the mean of its divisors is an integer number (10509067084).

Almost surely, 2^21018134167 is an apocalyptic number.

21018134167 is a deficient number, since it is larger than the sum of its proper divisors (1).

21018134167 is an equidigital number, since it uses as much as digits as its factorization.

21018134167 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 34.

The spelling of 21018134167 in words is "twenty-one billion, eighteen million, one hundred thirty-four thousand, one hundred sixty-seven".