13525530223221 has 32 divisors (see below), whose sum is σ = 20420146897920. Its totient is φ = 8845045065792.

The previous prime is 13525530223213. The next prime is 13525530223243. The reversal of 13525530223221 is 12232203552531.

13525530223221 is a `hidden beast` number, since 1 + 3 + 5 + 25 + 5 + 302 + 2 + 322 + 1 = 666.

It is not a de Polignac number, because 13525530223221 - 2³ = 13525530223213 is a prime.

It is a super-2 number, since 2×13525530223221² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13525530222221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5905500 + ... + 7869306.

It is an arithmetic number, because the mean of its divisors is an integer number (638129590560).

Almost surely, 2^{13525530223221} is an apocalyptic number.

It is an amenable number.

13525530223221 is a deficient number, since it is larger than the sum of its proper divisors (6894616674699).

13525530223221 is a wasteful number, since it uses less digits than its factorization.

13525530223221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1968682 (or 1968676 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 36.

Adding to 13525530223221 its reverse (12232203552531), we get a palindrome (25757733775752).

The spelling of 13525530223221 in words is "thirteen trillion, five hundred twenty-five billion, five hundred thirty million, two hundred twenty-three thousand, two hundred twenty-one".