1405331221 has 12 divisors (see below), whose sum is σ = 1635433740. Its totient is φ = 1204082880.

The previous prime is 1405331209. The next prime is 1405331227. The reversal of 1405331221 is 1221335041.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1098591025 + 306740196 = 33145^2 + 17514^2 .

It is not a de Polignac number, because 1405331221 - 2⁹ = 1405330709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1405331192 and 1405331201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1405331227) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 171465 + ... + 179473.

It is an arithmetic number, because the mean of its divisors is an integer number (136286145).

Almost surely, 2^1405331221 is an apocalyptic number.

It is an amenable number.

1405331221 is a deficient number, since it is larger than the sum of its proper divisors (230102519).

1405331221 is an equidigital number, since it uses as much as digits as its factorization.

1405331221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11604 (or 11597 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 1405331221 is about 37487.7476117198. The cubic root of 1405331221 is about 1120.1071381884.

Adding to 1405331221 its reverse (1221335041), we get a palindrome (2626666262).

The spelling of 1405331221 in words is "one billion, four hundred five million, three hundred thirty-one thousand, two hundred twenty-one".