21253235132536 has 64 divisors (see below), whose sum is σ = 46017429955200. Its totient is φ = 9110521392000.

The previous prime is 21253235132501. The next prime is 21253235132593. The reversal of 21253235132536 is 63523153235212.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a junction number, because it is equal to n+sod(n) for n = 21253235132492 and 21253235132501.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96728290 + ... + 96947761.

It is an arithmetic number, because the mean of its divisors is an integer number (719022343050).

Almost surely, 2^{21253235132536} is an apocalyptic number.

It is an amenable number.

21253235132536 is an abundant number, since it is smaller than the sum of its proper divisors (24764194822664).

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

21253235132536 is a wasteful number, since it uses less digits than its factorization.

21253235132536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193676140 (or 193676136 counting only the distinct ones).

The product of its digits is 972000, while the sum is 43.

Adding to 21253235132536 its reverse (63523153235212), we get a palindrome (84776388367748).

The spelling of 21253235132536 in words is "twenty-one trillion, two hundred fifty-three billion, two hundred thirty-five million, one hundred thirty-two thousand, five hundred thirty-six".