21403021169 has 2 divisors, whose sum is σ = 21403021170. Its totient is φ = 21403021168.

The previous prime is 21403021117. The next prime is 21403021193. The reversal of 21403021169 is 96112030412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21381750625 + 21270544 = 146225^2 + 4612^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21403021169 is a prime.

It is a super-2 number, since 2×21403021169² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21403021669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10701510584 + 10701510585.

It is an arithmetic number, because the mean of its divisors is an integer number (10701510585).

Almost surely, 2^21403021169 is an apocalyptic number.

It is an amenable number.

21403021169 is a deficient number, since it is larger than the sum of its proper divisors (1).

21403021169 is an equidigital number, since it uses as much as digits as its factorization.

21403021169 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 29.

The spelling of 21403021169 in words is "twenty-one billion, four hundred three million, twenty-one thousand, one hundred sixty-nine".