21253236025236 has 48 divisors (see below), whose sum is σ = 49643207222784. Its totient is φ = 7076938018176.

The previous prime is 21253236025207. The next prime is 21253236025237. The reversal of 21253236025236 is 63252063235212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21253236025237) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 326022301 + ... + 326087483.

It is an arithmetic number, because the mean of its divisors is an integer number (1034233483808).

Almost surely, 2^{21253236025236} is an apocalyptic number.

It is an amenable number.

21253236025236 is an abundant number, since it is smaller than the sum of its proper divisors (28389971197548).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21253236025236 is a wasteful number, since it uses less digits than its factorization.

21253236025236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93440 (or 93438 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 42.

The spelling of 21253236025236 in words is "twenty-one trillion, two hundred fifty-three billion, two hundred thirty-six million, twenty-five thousand, two hundred thirty-six".