1440212421 has 4 divisors (see below), whose sum is σ = 1920283232. Its totient is φ = 960141612.

The previous prime is 1440212381. The next prime is 1440212437. The reversal of 1440212421 is 1242120441.

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: 1242120441 = 3 ⋅414040147.

It is a de Polignac number, because none of the positive numbers 2^k-1440212421 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 (1440212441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 240035401 + ... + 240035406.

It is an arithmetic number, because the mean of its divisors is an integer number (480070808).

Almost surely, 2^1440212421 is an apocalyptic number.

It is an amenable number.

1440212421 is a deficient number, since it is larger than the sum of its proper divisors (480070811).

1440212421 is an equidigital number, since it uses as much as digits as its factorization.

1440212421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480070810.

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 1440212421 is about 37950.1307112373. The cubic root of 1440212421 is about 1129.2987585422.

Adding to 1440212421 its reverse (1242120441), we get a palindrome (2682332862).

The spelling of 1440212421 in words is "one billion, four hundred forty million, two hundred twelve thousand, four hundred twenty-one".