1242325421 has 4 divisors (see below), whose sum is σ = 1242474012. Its totient is φ = 1242176832.

The previous prime is 1242325387. The next prime is 1242325423. The reversal of 1242325421 is 1245232421.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 505800100 + 736525321 = 22490^2 + 27139^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1242325421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242325423) 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 in 3 ways as a sum of consecutive naturals, for example, 60956 + ... + 78741.

It is an arithmetic number, because the mean of its divisors is an integer number (310618503).

Almost surely, 2^1242325421 is an apocalyptic number.

It is an amenable number.

1242325421 is a deficient number, since it is larger than the sum of its proper divisors (148591).

1242325421 is an equidigital number, since it uses as much as digits as its factorization.

1242325421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148590.

The product of its digits is 3840, while the sum is 26.

The square root of 1242325421 is about 35246.6370168843. The cubic root of 1242325421 is about 1075.0082338652.

Adding to 1242325421 its reverse (1245232421), we get a palindrome (2487557842).

The spelling of 1242325421 in words is "one billion, two hundred forty-two million, three hundred twenty-five thousand, four hundred twenty-one".