21323476 has 6 divisors (see below), whose sum is σ = 37316090. Its totient is φ = 10661736.

The previous prime is 21323473. The next prime is 21323479. The reversal of 21323476 is 67432312.

It is an interprime number because it is at equal distance from previous prime (21323473) and next prime (21323479).

It can be written as a sum of positive squares in only one way, i.e., 15023376 + 6300100 = 3876^2 + 2510^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21323473) 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, 2665431 + ... + 2665438.

Almost surely, 2^21323476 is an apocalyptic number.

It is an amenable number.

21323476 is a deficient number, since it is larger than the sum of its proper divisors (15992614).

21323476 is a wasteful number, since it uses less digits than its factorization.

21323476 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5330873 (or 5330871 counting only the distinct ones).

The product of its digits is 6048, while the sum is 28.

The square root of 21323476 is about 4617.7349425882. The cubic root of 21323476 is about 277.3017863268.

Adding to 21323476 its reverse (67432312), we get a palindrome (88755788).

The spelling of 21323476 in words is "twenty-one million, three hundred twenty-three thousand, four hundred seventy-six".