13535402121 has 6 divisors (see below), whose sum is σ = 19551136410. Its totient is φ = 9023601408.

The previous prime is 13535402107. The next prime is 13535402141. The reversal of 13535402121 is 12120453531.

13535402121 is a `hidden beast` number, since 1 + 3 + 535 + 4 + 0 + 2 + 121 = 666.

It can be written as a sum of positive squares in only one way, i.e., 13367984400 + 167417721 = 115620^2 + 12939^2 .

It is not a de Polignac number, because 13535402121 - 2¹⁸ = 13535139977 is a prime.

It is a super-2 number, since 2×13535402121² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13535402141) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 751966776 + ... + 751966793.

It is an arithmetic number, because the mean of its divisors is an integer number (3258522735).

Almost surely, 2^13535402121 is an apocalyptic number.

It is an amenable number.

13535402121 is a deficient number, since it is larger than the sum of its proper divisors (6015734289).

13535402121 is a wasteful number, since it uses less digits than its factorization.

13535402121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1503933575 (or 1503933572 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

Adding to 13535402121 its reverse (12120453531), we get a palindrome (25655855652).

The spelling of 13535402121 in words is "thirteen billion, five hundred thirty-five million, four hundred two thousand, one hundred twenty-one".