13531202421 has 16 divisors (see below), whose sum is σ = 19683693120. Its totient is φ = 8199918720.

The previous prime is 13531202383. The next prime is 13531202449. The reversal of 13531202421 is 12420213531.

13531202421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13531202421 - 2¹⁴ = 13531186037 is a prime.

It is a super-2 number, since 2×13531202421² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 13531202391 and 13531202400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13531702421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 649515 + ... + 670023.

It is an arithmetic number, because the mean of its divisors is an integer number (1230230820).

Almost surely, 2^13531202421 is an apocalyptic number.

13531202421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13531202421 is a deficient number, since it is larger than the sum of its proper divisors (6152490699).

13531202421 is a wasteful number, since it uses less digits than its factorization.

13531202421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40516.

The product of its (nonzero) digits is 1440, while the sum is 24.

Adding to 13531202421 its reverse (12420213531), we get a palindrome (25951415952).

The spelling of 13531202421 in words is "thirteen billion, five hundred thirty-one million, two hundred two thousand, four hundred twenty-one".