12501421 has 4 divisors (see below), whose sum is σ = 12528000. Its totient is φ = 12474844.

The previous prime is 12501413. The next prime is 12501427. The reversal of 12501421 is 12410521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12410521 = 29 ⋅427949.

It is a cyclic number.

It is not a de Polignac number, because 12501421 - 2³ = 12501413 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12501395 and 12501404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12501427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12571 + ... + 13528.

It is an arithmetic number, because the mean of its divisors is an integer number (3132000).

Almost surely, 2^12501421 is an apocalyptic number.

It is an amenable number.

12501421 is a deficient number, since it is larger than the sum of its proper divisors (26579).

12501421 is an equidigital number, since it uses as much as digits as its factorization.

12501421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26578.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 12501421 is about 3535.7348599690. The cubic root of 12501421 is about 232.0882356111.

Adding to 12501421 its reverse (12410521), we get a palindrome (24911942).

The spelling of 12501421 in words is "twelve million, five hundred one thousand, four hundred twenty-one".