21254226 has 32 divisors (see below), whose sum is σ = 48964608. Its totient is φ = 6024720.

The previous prime is 21254221. The next prime is 21254227. The reversal of 21254226 is 62245212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21254196 and 21254205.

It is not an unprimeable number, because it can be changed into a prime (21254221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3571 + ... + 7433.

It is an arithmetic number, because the mean of its divisors is an integer number (1530144).

Almost surely, 2^21254226 is an apocalyptic number.

21254226 is an abundant number, since it is smaller than the sum of its proper divisors (27710382).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21254226 is a wasteful number, since it uses less digits than its factorization.

21254226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4006.

The product of its digits is 1920, while the sum is 24.

The square root of 21254226 is about 4610.2305799168. The cubic root of 21254226 is about 277.0012728723.

Adding to 21254226 its reverse (62245212), we get a palindrome (83499438).

The spelling of 21254226 in words is "twenty-one million, two hundred fifty-four thousand, two hundred twenty-six".