21253205344410 has 96 divisors (see below), whose sum is σ = 59516515618560. Its totient is φ = 5230895324544.

The previous prime is 21253205344381. The next prime is 21253205344457. The reversal of 21253205344410 is 1444350235212.

It is a happy number.

21253205344410 is a `hidden beast` number, since 2 + 1 + 2 + 5 + 3 + 205 + 3 + 4 + 441 + 0 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8118297 + ... + 10412163.

It is an arithmetic number, because the mean of its divisors is an integer number (619963704360).

Almost surely, 2^{21253205344410} is an apocalyptic number.

21253205344410 is an abundant number, since it is smaller than the sum of its proper divisors (38263310274150).

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

21253205344410 is a wasteful number, since it uses less digits than its factorization.

21253205344410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2301812 (or 2301809 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 36.

Adding to 21253205344410 its reverse (1444350235212), we get a palindrome (22697555579622).

The spelling of 21253205344410 in words is "twenty-one trillion, two hundred fifty-three billion, two hundred five million, three hundred forty-four thousand, four hundred ten".