1404221021 has 8 divisors (see below), whose sum is σ = 1638969600. Its totient is φ = 1178008848.

The previous prime is 1404220991. The next prime is 1404221023. The reversal of 1404221021 is 1201224041.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1404221021 - 2²² = 1400026717 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 (1404221023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2133746 + ... + 2134403.

It is an arithmetic number, because the mean of its divisors is an integer number (204871200).

Almost surely, 2^1404221021 is an apocalyptic number.

It is an amenable number.

1404221021 is a deficient number, since it is larger than the sum of its proper divisors (234748579).

1404221021 is an equidigital number, since it uses as much as digits as its factorization.

1404221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4268203.

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

The square root of 1404221021 is about 37472.9371813846. The cubic root of 1404221021 is about 1119.8121020354.

Adding to 1404221021 its reverse (1201224041), we get a palindrome (2605445062).

The spelling of 1404221021 in words is "one billion, four hundred four million, two hundred twenty-one thousand, twenty-one".