21254222 has 16 divisors (see below), whose sum is σ = 34998912. Its totient is φ = 9600120.

The previous prime is 21254221. The next prime is 21254227. The reversal of 21254222 is 22245212.

It is a junction number, because it is equal to n+sod(n) for n = 21254194 and 21254203.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 623 + ... + 6549.

It is an arithmetic number, because the mean of its divisors is an integer number (2187432).

Almost surely, 2^21254222 is an apocalyptic number.

21254222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21254222 is a deficient number, since it is larger than the sum of its proper divisors (13744690).

21254222 is a wasteful number, since it uses less digits than its factorization.

21254222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6103.

The product of its digits is 640, while the sum is 20.

The square root of 21254222 is about 4610.2301460990. The cubic root of 21254222 is about 277.0012554953.

Adding to 21254222 its reverse (22245212), we get a palindrome (43499434).

The spelling of 21254222 in words is "twenty-one million, two hundred fifty-four thousand, two hundred twenty-two".