21012001013167 has 2 divisors, whose sum is σ = 21012001013168. Its totient is φ = 21012001013166.

The previous prime is 21012001013099. The next prime is 21012001013177. The reversal of 21012001013167 is 76131010021012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21012001013167 - 2¹⁹ = 21012000488879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21012001013177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506000506583 + 10506000506584.

It is an arithmetic number, because the mean of its divisors is an integer number (10506000506584).

Almost surely, 2^{21012001013167} is an apocalyptic number.

21012001013167 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012001013167 is an equidigital number, since it uses as much as digits as its factorization.

21012001013167 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 25.

Adding to 21012001013167 its reverse (76131010021012), we get a palindrome (97143011034179).

The spelling of 21012001013167 in words is "twenty-one trillion, twelve billion, one million, thirteen thousand, one hundred sixty-seven".