1001440404421 has 2 divisors, whose sum is σ = 1001440404422. Its totient is φ = 1001440404420.

The previous prime is 1001440404413. The next prime is 1001440404499. The reversal of 1001440404421 is 1244040441001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 962625888225 + 38814516196 = 981135^2 + 197014^2 .

It is an emirp because it is prime and its reverse (1244040441001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1001440404421 - 2³ = 1001440404413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1001440404401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500720202210 + 500720202211.

It is an arithmetic number, because the mean of its divisors is an integer number (500720202211).

Almost surely, 2^{1001440404421} is an apocalyptic number.

It is an amenable number.

1001440404421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001440404421 is an equidigital number, since it uses as much as digits as its factorization.

1001440404421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2048, while the sum is 25.

Adding to 1001440404421 its reverse (1244040441001), we get a palindrome (2245480845422).

The spelling of 1001440404421 in words is "one trillion, one billion, four hundred forty million, four hundred four thousand, four hundred twenty-one".