13152421 has 2 divisors, whose sum is σ = 13152422. Its totient is φ = 13152420.

The previous prime is 13152413. The next prime is 13152493. The reversal of 13152421 is 12425131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9523396 + 3629025 = 3086^2 + 1905^2 .

It is an emirp because it is prime and its reverse (12425131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13152421 - 2³ = 13152413 is a prime.

It is a super-2 number, since 2×13152421² = 345972356322482, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13152721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6576210 + 6576211.

It is an arithmetic number, because the mean of its divisors is an integer number (6576211).

Almost surely, 2^13152421 is an apocalyptic number.

It is an amenable number.

13152421 is a deficient number, since it is larger than the sum of its proper divisors (1).

13152421 is an equidigital number, since it uses as much as digits as its factorization.

13152421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 240, while the sum is 19.

The square root of 13152421 is about 3626.6266695098. The cubic root of 13152421 is about 236.0488563507.

Adding to 13152421 its reverse (12425131), we get a palindrome (25577552).

The spelling of 13152421 in words is "thirteen million, one hundred fifty-two thousand, four hundred twenty-one".