21403226 has 8 divisors (see below), whose sum is σ = 34574484. Its totient is φ = 9878400.

The previous prime is 21403211. The next prime is 21403229. The reversal of 21403226 is 62230412.

It can be written as a sum of positive squares in 2 ways, for example, as 20839225 + 564001 = 4565^2 + 751^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21403198 and 21403207.

It is not an unprimeable number, because it can be changed into a prime (21403229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 411575 + ... + 411626.

Almost surely, 2^21403226 is an apocalyptic number.

21403226 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21403226 is a deficient number, since it is larger than the sum of its proper divisors (13171258).

21403226 is a wasteful number, since it uses less digits than its factorization.

21403226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 823216.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 21403226 is about 4626.3620697044. The cubic root of 21403226 is about 277.6470600011.

Adding to 21403226 its reverse (62230412), we get a palindrome (83633638).

The spelling of 21403226 in words is "twenty-one million, four hundred three thousand, two hundred twenty-six".