13531200021 has 12 divisors (see below), whose sum is σ = 19632715648. Its totient is φ = 8980346664.

The previous prime is 13531200019. The next prime is 13531200049. The reversal of 13531200021 is 12000213531.

It is not a de Polignac number, because 13531200021 - 2¹ = 13531200019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13531199967 and 13531200003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13531200821) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3368995 + ... + 3373008.

Almost surely, 2^13531200021 is an apocalyptic number.

It is an amenable number.

13531200021 is a deficient number, since it is larger than the sum of its proper divisors (6101515627).

13531200021 is a wasteful number, since it uses less digits than its factorization.

13531200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6742232 (or 6742229 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

Adding to 13531200021 its reverse (12000213531), we get a palindrome (25531413552).

The spelling of 13531200021 in words is "thirteen billion, five hundred thirty-one million, two hundred thousand, twenty-one".