1240230421 has 4 divisors (see below), whose sum is σ = 1240880652. Its totient is φ = 1239580192.

The previous prime is 1240230413. The next prime is 1240230463. The reversal of 1240230421 is 1240320421.

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 836019396 + 404211025 = 28914^2 + 20105^2 .

It is a cyclic number.

It is not a de Polignac number, because 1240230421 - 2³ = 1240230413 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 (1240230221) 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, 322246 + ... + 326071.

It is an arithmetic number, because the mean of its divisors is an integer number (310220163).

Almost surely, 2^1240230421 is an apocalyptic number.

It is an amenable number.

1240230421 is a deficient number, since it is larger than the sum of its proper divisors (650231).

1240230421 is an equidigital number, since it uses as much as digits as its factorization.

1240230421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 650230.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 1240230421 is about 35216.9053296851. The cubic root of 1240230421 is about 1074.4036125186.

Adding to 1240230421 its reverse (1240320421), we get a palindrome (2480550842).

Subtracting 1240230421 from its reverse (1240320421), we obtain a square (90000 = 300²).

The spelling of 1240230421 in words is "one billion, two hundred forty million, two hundred thirty thousand, four hundred twenty-one".