21910219169 has 2 divisors, whose sum is σ = 21910219170. Its totient is φ = 21910219168.

The previous prime is 21910219141. The next prime is 21910219187. The reversal of 21910219169 is 96191201912.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21495078544 + 415140625 = 146612^2 + 20375^2 .

It is a cyclic number.

It is not a de Polignac number, because 21910219169 - 2¹⁶ = 21910153633 is a prime.

It is a super-2 number, since 2×21910219169² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21910219469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10955109584 + 10955109585.

It is an arithmetic number, because the mean of its divisors is an integer number (10955109585).

Almost surely, 2^21910219169 is an apocalyptic number.

It is an amenable number.

21910219169 is a deficient number, since it is larger than the sum of its proper divisors (1).

21910219169 is an equidigital number, since it uses as much as digits as its factorization.

21910219169 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496, while the sum is 41.

The spelling of 21910219169 in words is "twenty-one billion, nine hundred ten million, two hundred nineteen thousand, one hundred sixty-nine".