21220848967 has 2 divisors, whose sum is σ = 21220848968. Its totient is φ = 21220848966.

The previous prime is 21220848959. The next prime is 21220848997. The reversal of 21220848967 is 76984802212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21220848967 - 2³ = 21220848959 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21220848967.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21220848947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610424483 + 10610424484.

It is an arithmetic number, because the mean of its divisors is an integer number (10610424484).

Almost surely, 2^21220848967 is an apocalyptic number.

21220848967 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220848967 is an equidigital number, since it uses as much as digits as its factorization.

21220848967 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 774144, while the sum is 49.

The spelling of 21220848967 in words is "twenty-one billion, two hundred twenty million, eight hundred forty-eight thousand, nine hundred sixty-seven".