21245012167 has 2 divisors, whose sum is σ = 21245012168. Its totient is φ = 21245012166.

The previous prime is 21245012161. The next prime is 21245012177. The reversal of 21245012167 is 76121054212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21245012167 - 2¹¹ = 21245010119 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21245012161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10622506083 + 10622506084.

It is an arithmetic number, because the mean of its divisors is an integer number (10622506084).

Almost surely, 2^21245012167 is an apocalyptic number.

21245012167 is a deficient number, since it is larger than the sum of its proper divisors (1).

21245012167 is an equidigital number, since it uses as much as digits as its factorization.

21245012167 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6720, while the sum is 31.

Adding to 21245012167 its reverse (76121054212), we get a palindrome (97366066379).

The spelling of 21245012167 in words is "twenty-one billion, two hundred forty-five million, twelve thousand, one hundred sixty-seven".