21423476 has 6 divisors (see below), whose sum is σ = 37491090. Its totient is φ = 10711736.

The previous prime is 21423421. The next prime is 21423487. The reversal of 21423476 is 67432412.

It can be written as a sum of positive squares in only one way, i.e., 20160100 + 1263376 = 4490^2 + 1124^2 .

It is a congruent number.

It is an unprimeable number.

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, 2677931 + ... + 2677938.

It is an arithmetic number, because the mean of its divisors is an integer number (6248515).

Almost surely, 2^21423476 is an apocalyptic number.

It is an amenable number.

21423476 is a deficient number, since it is larger than the sum of its proper divisors (16067614).

21423476 is a wasteful number, since it uses less digits than its factorization.

21423476 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5355873 (or 5355871 counting only the distinct ones).

The product of its digits is 8064, while the sum is 29.

The square root of 21423476 is about 4628.5500969526. The cubic root of 21423476 is about 277.7345947924.

Adding to 21423476 its reverse (67432412), we get a palindrome (88855888).

The spelling of 21423476 in words is "twenty-one million, four hundred twenty-three thousand, four hundred seventy-six".