21535003500425 has 12 divisors (see below), whose sum is σ = 26703749184000. Its totient is φ = 17227780320720.

The previous prime is 21535003500407. The next prime is 21535003500449. The reversal of 21535003500425 is 52400530053512.

It is a de Polignac number, because none of the positive numbers 2^k-21535003500425 is a prime.

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 11 ways as a sum of consecutive naturals, for example, 3573425 + ... + 7472574.

It is an arithmetic number, because the mean of its divisors is an integer number (2225312432000).

Almost surely, 2^{21535003500425} is an apocalyptic number.

21535003500425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21535003500425 is a deficient number, since it is larger than the sum of its proper divisors (5168745683575).

21535003500425 is a wasteful number, since it uses less digits than its factorization.

21535003500425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11123992 (or 11123987 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 35.

Adding to 21535003500425 its reverse (52400530053512), we get a palindrome (73935533553937).

The spelling of 21535003500425 in words is "twenty-one trillion, five hundred thirty-five billion, three million, five hundred thousand, four hundred twenty-five".