21236476 has 12 divisors (see below), whose sum is σ = 37219672. Its totient is φ = 10602288.

The previous prime is 21236473. The next prime is 21236477. The reversal of 21236476 is 67463212.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21236473) 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 in 3 ways as a sum of consecutive naturals, for example, 690 + ... + 6553.

Almost surely, 2^21236476 is an apocalyptic number.

It is an amenable number.

21236476 is a deficient number, since it is larger than the sum of its proper divisors (15983196).

21236476 is a wasteful number, since it uses less digits than its factorization.

21236476 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7980 (or 7978 counting only the distinct ones).

The product of its digits is 12096, while the sum is 31.

The square root of 21236476 is about 4608.3051114265. The cubic root of 21236476 is about 276.9241408870.

Adding to 21236476 its reverse (67463212), we get a palindrome (88699688).

It can be divided in two parts, 21236 and 476, that added together give a palindrome (21712).

The spelling of 21236476 in words is "twenty-one million, two hundred thirty-six thousand, four hundred seventy-six".