21150221141225 has 48 divisors (see below), whose sum is σ = 29372436668736. Its totient is φ = 14973967488000.

The previous prime is 21150221141213. The next prime is 21150221141243. The reversal of 21150221141225 is 52214112205112.

It is a happy number.

It is not a de Polignac number, because 21150221141225 - 2³⁴ = 21133041272041 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3100322 + ... + 7205028.

It is an arithmetic number, because the mean of its divisors is an integer number (611925763932).

Almost surely, 2^{21150221141225} is an apocalyptic number.

21150221141225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21150221141225 is a deficient number, since it is larger than the sum of its proper divisors (8222215527511).

21150221141225 is a wasteful number, since it uses less digits than its factorization.

21150221141225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4105226 (or 4105221 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 29.

Adding to 21150221141225 its reverse (52214112205112), we get a palindrome (73364333346337).

The spelling of 21150221141225 in words is "twenty-one trillion, one hundred fifty billion, two hundred twenty-one million, one hundred forty-one thousand, two hundred twenty-five".