21043233525 has 24 divisors (see below), whose sum is σ = 35381172960. Its totient is φ = 11032834240.

The previous prime is 21043233521. The next prime is 21043233553. The reversal of 21043233525 is 52533234012.

It is not a de Polignac number, because 21043233525 - 2² = 21043233521 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21043233492 and 21043233501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21043233521) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 2373342 + ... + 2382191.

It is an arithmetic number, because the mean of its divisors is an integer number (1474215540).

Almost surely, 2^21043233525 is an apocalyptic number.

21043233525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21043233525 is a deficient number, since it is larger than the sum of its proper divisors (14337939435).

21043233525 is a wasteful number, since it uses less digits than its factorization.

21043233525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4755605 (or 4755600 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 30.

Adding to 21043233525 its reverse (52533234012), we get a palindrome (73576467537).

The spelling of 21043233525 in words is "twenty-one billion, forty-three million, two hundred thirty-three thousand, five hundred twenty-five".