21341215225 has 48 divisors (see below), whose sum is σ = 29305624320. Its totient is φ = 15287227200.

The previous prime is 21341215187. The next prime is 21341215241. The reversal of 21341215225 is 52251214312.

It is a happy number.

It is not a de Polignac number, because 21341215225 - 2⁷ = 21341215097 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21341215193 and 21341215202.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8649442 + ... + 8651908.

It is an arithmetic number, because the mean of its divisors is an integer number (610533840).

Almost surely, 2^21341215225 is an apocalyptic number.

21341215225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21341215225 is a deficient number, since it is larger than the sum of its proper divisors (7964409095).

21341215225 is a wasteful number, since it uses less digits than its factorization.

21341215225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2950 (or 2945 counting only the distinct ones).

The product of its digits is 4800, while the sum is 28.

Adding to 21341215225 its reverse (52251214312), we get a palindrome (73592429537).

It can be divided in two parts, 2134121 and 5225, that added together give a triangular number (2139346 = T₂₀₆₈).

The spelling of 21341215225 in words is "twenty-one billion, three hundred forty-one million, two hundred fifteen thousand, two hundred twenty-five".