1200240421 has 4 divisors (see below), whose sum is σ = 1203374592. Its totient is φ = 1197106252.

The previous prime is 1200240413. The next prime is 1200240449. The reversal of 1200240421 is 1240420021.

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.

It is a cyclic number.

It is not a de Polignac number, because 1200240421 - 2³ = 1200240413 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1200240395 and 1200240404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200240221) 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, 1566511 + ... + 1567276.

It is an arithmetic number, because the mean of its divisors is an integer number (300843648).

Almost surely, 2^1200240421 is an apocalyptic number.

It is an amenable number.

1200240421 is a deficient number, since it is larger than the sum of its proper divisors (3134171).

1200240421 is an equidigital number, since it uses as much as digits as its factorization.

1200240421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3134170.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 1200240421 is about 34644.4861558084. The cubic root of 1200240421 is about 1062.7295326203.

Adding to 1200240421 its reverse (1240420021), we get a palindrome (2440660442).

The spelling of 1200240421 in words is "one billion, two hundred million, two hundred forty thousand, four hundred twenty-one".