1404401021 has 2 divisors, whose sum is σ = 1404401022. Its totient is φ = 1404401020.

The previous prime is 1404400997. The next prime is 1404401023. The reversal of 1404401021 is 1201044041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 885062500 + 519338521 = 29750^2 + 22789^2 .

It is an emirp because it is prime and its reverse (1201044041) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1404401021 is a prime.

It is a Sophie Germain prime.

Together with 1404401023, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1404401023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 702200510 + 702200511.

It is an arithmetic number, because the mean of its divisors is an integer number (702200511).

Almost surely, 2^1404401021 is an apocalyptic number.

It is an amenable number.

1404401021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1404401021 is an equidigital number, since it uses as much as digits as its factorization.

1404401021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 1404401021 is about 37475.3388376943. The cubic root of 1404401021 is about 1119.8599476768.

Adding to 1404401021 its reverse (1201044041), we get a palindrome (2605445062).

The spelling of 1404401021 in words is "one billion, four hundred four million, four hundred one thousand, twenty-one".