15132421 has 2 divisors, whose sum is σ = 15132422. Its totient is φ = 15132420.

The previous prime is 15132409. The next prime is 15132427. The reversal of 15132421 is 12423151.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15124321 + 8100 = 3889^2 + 90^2 .

It is a cyclic number.

It is not a de Polignac number, because 15132421 - 2¹³ = 15124229 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15132427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7566210 + 7566211.

It is an arithmetic number, because the mean of its divisors is an integer number (7566211).

Almost surely, 2^15132421 is an apocalyptic number.

It is an amenable number.

15132421 is a deficient number, since it is larger than the sum of its proper divisors (1).

15132421 is an equidigital number, since it uses as much as digits as its factorization.

15132421 is an odious number, because the sum of its binary digits is odd.

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

The square root of 15132421 is about 3890.0412594213. The cubic root of 15132421 is about 247.3448117366.

Adding to 15132421 its reverse (12423151), we get a palindrome (27555572).

The spelling of 15132421 in words is "fifteen million, one hundred thirty-two thousand, four hundred twenty-one".