13052421 has 10 divisors (see below), whose sum is σ = 19498182. Its totient is φ = 8701560.

The previous prime is 13052419. The next prime is 13052437. The reversal of 13052421 is 12425031.

It can be written as a sum of positive squares in only one way, i.e., 8767521 + 4284900 = 2961^2 + 2070^2 .

It is not a de Polignac number, because 13052421 - 2¹ = 13052419 is a prime.

It is a super-2 number, since 2×13052421² = 340731387922482, which contains 22 as substring.

It is a plaindrome in base 12.

It is a zygodrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 13052394 and 13052403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13052441) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 80490 + ... + 80651.

Almost surely, 2^13052421 is an apocalyptic number.

It is an amenable number.

13052421 is a deficient number, since it is larger than the sum of its proper divisors (6445761).

13052421 is an equidigital number, since it uses as much as digits as its factorization.

13052421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161153 (or 161144 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 13052421 is about 3612.8134466092. The cubic root of 13052421 is about 235.4490944375.

Adding to 13052421 its reverse (12425031), we get a palindrome (25477452).

The spelling of 13052421 in words is "thirteen million, fifty-two thousand, four hundred twenty-one".