21012453167 has 2 divisors, whose sum is σ = 21012453168. Its totient is φ = 21012453166.

The previous prime is 21012453083. The next prime is 21012453181. The reversal of 21012453167 is 76135421012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21012453167 - 2¹⁰ = 21012452143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21012453667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506226583 + 10506226584.

It is an arithmetic number, because the mean of its divisors is an integer number (10506226584).

Almost surely, 2^21012453167 is an apocalyptic number.

21012453167 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012453167 is an equidigital number, since it uses as much as digits as its factorization.

21012453167 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 32.

Adding to 21012453167 its reverse (76135421012), we get a palindrome (97147874179).

The spelling of 21012453167 in words is "twenty-one billion, twelve million, four hundred fifty-three thousand, one hundred sixty-seven".