21350423225 has 6 divisors (see below), whose sum is σ = 26474524830. Its totient is φ = 17080338560.

The previous prime is 21350423221. The next prime is 21350423231. The reversal of 21350423225 is 52232405312.

It can be written as a sum of positive squares in 3 ways, for example, as 755590144 + 20594833081 = 27488^2 + 143509^2 .

It is not a de Polignac number, because 21350423225 - 2² = 21350423221 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21350423221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 427008440 + ... + 427008489.

It is an arithmetic number, because the mean of its divisors is an integer number (4412420805).

Almost surely, 2^21350423225 is an apocalyptic number.

21350423225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21350423225 is a deficient number, since it is larger than the sum of its proper divisors (5124101605).

21350423225 is an equidigital number, since it uses as much as digits as its factorization.

21350423225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 854016939 (or 854016934 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 29.

Adding to 21350423225 its reverse (52232405312), we get a palindrome (73582828537).

The spelling of 21350423225 in words is "twenty-one billion, three hundred fifty million, four hundred twenty-three thousand, two hundred twenty-five".