1421217440 has 48 divisors (see below), whose sum is σ = 3439535400. Its totient is φ = 554618880.

The previous prime is 1421217433. The next prime is 1421217463. The reversal of 1421217440 is 447121241.

It can be written as a sum of positive squares in 4 ways, for example, as 399520144 + 1021697296 = 19988^2 + 31964^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101765 + ... + 114884.

Almost surely, 2^1421217440 is an apocalyptic number.

1421217440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1421217440 is an abundant number, since it is smaller than the sum of its proper divisors (2018317960).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1421217440 is a wasteful number, since it uses less digits than its factorization.

1421217440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216705 (or 216697 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 26.

The square root of 1421217440 is about 37699.0376534999. The cubic root of 1421217440 is about 1124.3119915062.

Adding to 1421217440 its reverse (447121241), we get a palindrome (1868338681).

The spelling of 1421217440 in words is "one billion, four hundred twenty-one million, two hundred seventeen thousand, four hundred forty".