21221020233167 has 2 divisors, whose sum is σ = 21221020233168. Its totient is φ = 21221020233166.

The previous prime is 21221020233151. The next prime is 21221020233233. The reversal of 21221020233167 is 76133202012212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21221020233167 - 2⁴ = 21221020233151 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21221020233067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610510116583 + 10610510116584.

It is an arithmetic number, because the mean of its divisors is an integer number (10610510116584).

Almost surely, 2^{21221020233167} is an apocalyptic number.

21221020233167 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221020233167 is an equidigital number, since it uses as much as digits as its factorization.

21221020233167 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 32.

Adding to 21221020233167 its reverse (76133202012212), we get a palindrome (97354222245379).

The spelling of 21221020233167 in words is "twenty-one trillion, two hundred twenty-one billion, twenty million, two hundred thirty-three thousand, one hundred sixty-seven".