21032520225 has 12 divisors (see below), whose sum is σ = 34773766896. Its totient is φ = 11217344080.

The previous prime is 21032520221. The next prime is 21032520247. The reversal of 21032520225 is 52202523012.

It is not a de Polignac number, because 21032520225 - 2² = 21032520221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21032520195 and 21032520204.

It is not an unprimeable number, because it can be changed into a prime (21032520221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 140216727 + ... + 140216876.

It is an arithmetic number, because the mean of its divisors is an integer number (2897813908).

Almost surely, 2^21032520225 is an apocalyptic number.

21032520225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21032520225 is a deficient number, since it is larger than the sum of its proper divisors (13741246671).

21032520225 is a wasteful number, since it uses less digits than its factorization.

21032520225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280433616 (or 280433611 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

The spelling of 21032520225 in words is "twenty-one billion, thirty-two million, five hundred twenty thousand, two hundred twenty-five".