21226473 has 6 divisors (see below), whose sum is σ = 30660474. Its totient is φ = 14150976.

The previous prime is 21226453. The next prime is 21226481. The reversal of 21226473 is 37462212.

21226473 is a `hidden beast` number, since 2 + 12 + 2 + 647 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 19954089 + 1272384 = 4467^2 + 1128^2 .

It is not a de Polignac number, because 21226473 - 2⁵ = 21226441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21226423) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1179240 + ... + 1179257.

It is an arithmetic number, because the mean of its divisors is an integer number (5110079).

Almost surely, 2^21226473 is an apocalyptic number.

It is an amenable number.

21226473 is a deficient number, since it is larger than the sum of its proper divisors (9434001).

21226473 is a wasteful number, since it uses less digits than its factorization.

21226473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2358503 (or 2358500 counting only the distinct ones).

The product of its digits is 4032, while the sum is 27.

The square root of 21226473 is about 4607.2196604894. The cubic root of 21226473 is about 276.8806542743.

Adding to 21226473 its reverse (37462212), we get a palindrome (58688685).

The spelling of 21226473 in words is "twenty-one million, two hundred twenty-six thousand, four hundred seventy-three".