21262225 has 12 divisors (see below), whose sum is σ = 26482060. Its totient is φ = 16934400.

The previous prime is 21262211. The next prime is 21262229. The reversal of 21262225 is 52226212.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 1272384 + 19989841 = 1128^2 + 4471^2 .

It is not a de Polignac number, because 21262225 - 2¹¹ = 21260177 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21262196 and 21262205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21262229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4261 + ... + 7789.

Almost surely, 2^21262225 is an apocalyptic number.

21262225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21262225 is a deficient number, since it is larger than the sum of its proper divisors (5219835).

21262225 is a wasteful number, since it uses less digits than its factorization.

21262225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3780 (or 3775 counting only the distinct ones).

The product of its digits is 960, while the sum is 22.

The square root of 21262225 is about 4611.0980254165. The cubic root of 21262225 is about 277.0360182021.

Adding to 21262225 its reverse (52226212), we get a palindrome (73488437).

The spelling of 21262225 in words is "twenty-one million, two hundred sixty-two thousand, two hundred twenty-five".