21476369 has 2 divisors, whose sum is σ = 21476370. Its totient is φ = 21476368.

The previous prime is 21476353. The next prime is 21476383. The reversal of 21476369 is 96367412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14922769 + 6553600 = 3863^2 + 2560^2 .

It is a cyclic number.

It is not a de Polignac number, because 21476369 - 2⁴ = 21476353 is a prime.

It is a super-2 number, since 2×21476369² = 922468850848322, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (21476339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10738184 + 10738185.

It is an arithmetic number, because the mean of its divisors is an integer number (10738185).

Almost surely, 2^21476369 is an apocalyptic number.

It is an amenable number.

21476369 is a deficient number, since it is larger than the sum of its proper divisors (1).

21476369 is an equidigital number, since it uses as much as digits as its factorization.

21476369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 38.

The square root of 21476369 is about 4634.2603509082. The cubic root of 21476369 is about 277.9629757639.

The spelling of 21476369 in words is "twenty-one million, four hundred seventy-six thousand, three hundred sixty-nine".