21010300169 has 2 divisors, whose sum is σ = 21010300170. Its totient is φ = 21010300168.

The previous prime is 21010300159. The next prime is 21010300217. The reversal of 21010300169 is 96100301012.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20876782144 + 133518025 = 144488^2 + 11555^2 .

It is a cyclic number.

It is not a de Polignac number, because 21010300169 - 2¹⁶ = 21010234633 is a prime.

It is a super-2 number, since 2×21010300169² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21010300109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505150084 + 10505150085.

It is an arithmetic number, because the mean of its divisors is an integer number (10505150085).

Almost surely, 2^21010300169 is an apocalyptic number.

It is an amenable number.

21010300169 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010300169 is an equidigital number, since it uses as much as digits as its factorization.

21010300169 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 23.

The spelling of 21010300169 in words is "twenty-one billion, ten million, three hundred thousand, one hundred sixty-nine".