21335040525 has 24 divisors (see below), whose sum is σ = 35623193184. Its totient is φ = 11266024000.

The previous prime is 21335040521. The next prime is 21335040527. The reversal of 21335040525 is 52504053312.

It is not a de Polignac number, because 21335040525 - 2² = 21335040521 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21335040492 and 21335040501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21335040521) 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 23 ways as a sum of consecutive naturals, for example, 1400679 + ... + 1415828.

It is an arithmetic number, because the mean of its divisors is an integer number (1484299716).

Almost surely, 2^21335040525 is an apocalyptic number.

21335040525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21335040525 is a deficient number, since it is larger than the sum of its proper divisors (14288152659).

21335040525 is a wasteful number, since it uses less digits than its factorization.

21335040525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2816621 (or 2816616 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 30.

Adding to 21335040525 its reverse (52504053312), we get a palindrome (73839093837).

The spelling of 21335040525 in words is "twenty-one billion, three hundred thirty-five million, forty thousand, five hundred twenty-five".