15126421 has 2 divisors, whose sum is σ = 15126422. Its totient is φ = 15126420.

The previous prime is 15126383. The next prime is 15126427. The reversal of 15126421 is 12462151.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8439025 + 6687396 = 2905^2 + 2586^2 .

It is a cyclic number.

It is not a de Polignac number, because 15126421 - 2¹⁵ = 15093653 is a prime.

It is a super-2 number, since 2×15126421² = 457617224538482, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 15126392 and 15126401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15126427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7563210 + 7563211.

It is an arithmetic number, because the mean of its divisors is an integer number (7563211).

Almost surely, 2^15126421 is an apocalyptic number.

It is an amenable number.

15126421 is a deficient number, since it is larger than the sum of its proper divisors (1).

15126421 is an equidigital number, since it uses as much as digits as its factorization.

15126421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 480, while the sum is 22.

The square root of 15126421 is about 3889.2699829145. The cubic root of 15126421 is about 247.3121167026.

Adding to 15126421 its reverse (12462151), we get a palindrome (27588572).

The spelling of 15126421 in words is "fifteen million, one hundred twenty-six thousand, four hundred twenty-one".