21230253225 has 48 divisors (see below), whose sum is σ = 41294946240. Its totient is φ = 10656748800.

The previous prime is 21230253223. The next prime is 21230253241. The reversal of 21230253225 is 52235203212.

21230253225 is a `hidden beast` number, since 2 + 123 + 0 + 2 + 532 + 2 + 5 = 666.

It is not a de Polignac number, because 21230253225 - 2¹ = 21230253223 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21230253223) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 913591 + ... + 936540.

It is an arithmetic number, because the mean of its divisors is an integer number (860311380).

Almost surely, 2^21230253225 is an apocalyptic number.

21230253225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21230253225 is a deficient number, since it is larger than the sum of its proper divisors (20064693015).

21230253225 is a wasteful number, since it uses less digits than its factorization.

21230253225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1850167 (or 1850156 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

Adding to 21230253225 its reverse (52235203212), we get a palindrome (73465456437).

The spelling of 21230253225 in words is "twenty-one billion, two hundred thirty million, two hundred fifty-three thousand, two hundred twenty-five".