21020402314169 has 2 divisors, whose sum is σ = 21020402314170. Its totient is φ = 21020402314168.

The previous prime is 21020402314159. The next prime is 21020402314231. The reversal of 21020402314169 is 96141320402012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18014617275769 + 3005785038400 = 4244363^2 + 1733720^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21020402314169 is a prime.

It is a super-2 number, since 2×21020402314169² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21020402314159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510201157084 + 10510201157085.

It is an arithmetic number, because the mean of its divisors is an integer number (10510201157085).

Almost surely, 2^{21020402314169} is an apocalyptic number.

It is an amenable number.

21020402314169 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020402314169 is an equidigital number, since it uses as much as digits as its factorization.

21020402314169 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 35.

The spelling of 21020402314169 in words is "twenty-one trillion, twenty billion, four hundred two million, three hundred fourteen thousand, one hundred sixty-nine".