21162469 has 2 divisors, whose sum is σ = 21162470. Its totient is φ = 21162468.

The previous prime is 21162439. The next prime is 21162487. The reversal of 21162469 is 96426112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19980900 + 1181569 = 4470^2 + 1087^2 .

It is a cyclic number.

It is not a de Polignac number, because 21162469 - 2²¹ = 19065317 is a prime.

It is a super-2 number, since 2×21162469² = 895700188351922, which contains 22 as substring.

It is equal to p_1339555 and since 21162469 and 1339555 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21162469.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21162439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10581234 + 10581235.

It is an arithmetic number, because the mean of its divisors is an integer number (10581235).

Almost surely, 2^21162469 is an apocalyptic number.

It is an amenable number.

21162469 is a deficient number, since it is larger than the sum of its proper divisors (1).

21162469 is an equidigital number, since it uses as much as digits as its factorization.

21162469 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 31.

The square root of 21162469 is about 4600.2683617372. The cubic root of 21162469 is about 276.6020821489.

The spelling of 21162469 in words is "twenty-one million, one hundred sixty-two thousand, four hundred sixty-nine".