21201021210167 has 2 divisors, whose sum is σ = 21201021210168. Its totient is φ = 21201021210166.

The previous prime is 21201021210157. The next prime is 21201021210221. The reversal of 21201021210167 is 76101212010212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21201021210167 - 2¹⁴ = 21201021193783 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21201021210107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600510605083 + 10600510605084.

It is an arithmetic number, because the mean of its divisors is an integer number (10600510605084).

Almost surely, 2^{21201021210167} is an apocalyptic number.

21201021210167 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201021210167 is an equidigital number, since it uses as much as digits as its factorization.

21201021210167 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 26.

Adding to 21201021210167 its reverse (76101212010212), we get a palindrome (97302233220379).

The spelling of 21201021210167 in words is "twenty-one trillion, two hundred one billion, twenty-one million, two hundred ten thousand, one hundred sixty-seven".