21253225264635 has 96 divisors (see below), whose sum is σ = 42707183383872. Its totient is φ = 8945801948160.

The previous prime is 21253225264589. The next prime is 21253225264639. The reversal of 21253225264635 is 53646252235212.

It is not a de Polignac number, because 21253225264635 - 2⁸ = 21253225264379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21253225264639) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 991945 + ... + 6594725.

It is an arithmetic number, because the mean of its divisors is an integer number (444866493582).

Almost surely, 2^{21253225264635} is an apocalyptic number.

21253225264635 is an abundant number, since it is smaller than the sum of its proper divisors (21453958119237).

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

21253225264635 is a wasteful number, since it uses less digits than its factorization.

21253225264635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5603213 (or 5603206 counting only the distinct ones).

The product of its digits is 5184000, while the sum is 48.

Adding to 21253225264635 its reverse (53646252235212), we get a palindrome (74899477499847).

The spelling of 21253225264635 in words is "twenty-one trillion, two hundred fifty-three billion, two hundred twenty-five million, two hundred sixty-four thousand, six hundred thirty-five".