21413523015253 has 4 divisors (see below), whose sum is σ = 21413816854668. Its totient is φ = 21413229175840.

The previous prime is 21413523015217. The next prime is 21413523015289. The reversal of 21413523015253 is 35251032531412.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21413523015217) and next prime (21413523015289).

It can be written as a sum of positive squares in 2 ways, for example, as 190115184484 + 21223407830769 = 436022^2 + 4606887^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21413523015253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21413523015293) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146810368 + ... + 146956153.

It is an arithmetic number, because the mean of its divisors is an integer number (5353454213667).

Almost surely, 2^{21413523015253} is an apocalyptic number.

It is an amenable number.

21413523015253 is a deficient number, since it is larger than the sum of its proper divisors (293839415).

21413523015253 is an equidigital number, since it uses as much as digits as its factorization.

21413523015253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293839414.

The product of its (nonzero) digits is 108000, while the sum is 37.

Adding to 21413523015253 its reverse (35251032531412), we get a palindrome (56664555546665).

The spelling of 21413523015253 in words is "twenty-one trillion, four hundred thirteen billion, five hundred twenty-three million, fifteen thousand, two hundred fifty-three".