21221022167 has 2 divisors, whose sum is σ = 21221022168. Its totient is φ = 21221022166.

The previous prime is 21221022113. The next prime is 21221022239. The reversal of 21221022167 is 76122012212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21221022167 - 2⁶ = 21221022103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21221022367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610511083 + 10610511084.

It is an arithmetic number, because the mean of its divisors is an integer number (10610511084).

Almost surely, 2^21221022167 is an apocalyptic number.

21221022167 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221022167 is an equidigital number, since it uses as much as digits as its factorization.

21221022167 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 26.

Adding to 21221022167 its reverse (76122012212), we get a palindrome (97343034379).

The spelling of 21221022167 in words is "twenty-one billion, two hundred twenty-one million, twenty-two thousand, one hundred sixty-seven".