21001211001167 has 2 divisors, whose sum is σ = 21001211001168. Its totient is φ = 21001211001166.

The previous prime is 21001211001049. The next prime is 21001211001179. The reversal of 21001211001167 is 76110011210012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21001211001167 - 2⁴² = 16603164490063 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21001211001467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500605500583 + 10500605500584.

It is an arithmetic number, because the mean of its divisors is an integer number (10500605500584).

Almost surely, 2^{21001211001167} is an apocalyptic number.

21001211001167 is a deficient number, since it is larger than the sum of its proper divisors (1).

21001211001167 is an equidigital number, since it uses as much as digits as its factorization.

21001211001167 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 168, while the sum is 23.

Adding to 21001211001167 its reverse (76110011210012), we get a palindrome (97111222211179).

The spelling of 21001211001167 in words is "twenty-one trillion, one billion, two hundred eleven million, one thousand, one hundred sixty-seven".