21325041521 has 12 divisors (see below), whose sum is σ = 24842620080. Its totient is φ = 18252125640.

The previous prime is 21325041481. The next prime is 21325041527. The reversal of 21325041521 is 12514052312.

It is not a de Polignac number, because 21325041521 - 2¹⁰ = 21325040497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21325041527) 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 11 ways as a sum of consecutive naturals, for example, 281051 + ... + 348768.

It is an arithmetic number, because the mean of its divisors is an integer number (2070218340).

Almost surely, 2^21325041521 is an apocalyptic number.

It is an amenable number.

21325041521 is a deficient number, since it is larger than the sum of its proper divisors (3517578559).

21325041521 is an equidigital number, since it uses as much as digits as its factorization.

21325041521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630524 (or 630517 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 21325041521 its reverse (12514052312), we get a palindrome (33839093833).

The spelling of 21325041521 in words is "twenty-one billion, three hundred twenty-five million, forty-one thousand, five hundred twenty-one".