21141225 has 72 divisors (see below), whose sum is σ = 44774912. Its totient is φ = 9331200.

The previous prime is 21141161. The next prime is 21141227. The reversal of 21141225 is 52214112.

It is not a de Polignac number, because 21141225 - 2⁶ = 21141161 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21141198 and 21141207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21141227) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 48609 + ... + 49041.

Almost surely, 2^21141225 is an apocalyptic number.

21141225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21141225 is an abundant number, since it is smaller than the sum of its proper divisors (23633687).

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

21141225 is a wasteful number, since it uses less digits than its factorization.

21141225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487 (or 479 counting only the distinct ones).

The product of its digits is 160, while the sum is 18.

The square root of 21141225 is about 4597.9587862442. The cubic root of 21141225 is about 276.5094952523.

Adding to 21141225 its reverse (52214112), we get a palindrome (73355337).

It can be divided in two parts, 21 and 141225, that added together give a triangular number (141246 = T₅₃₁).

The spelling of 21141225 in words is "twenty-one million, one hundred forty-one thousand, two hundred twenty-five".