1021400404 has 18 divisors (see below), whose sum is σ = 1886481114. Its totient is φ = 483820560.

The previous prime is 1021400383. The next prime is 1021400449. The reversal of 1021400404 is 4040041201.

1021400404 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 537312400 + 484088004 = 23180^2 + 22002^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 352227 + ... + 355114.

Almost surely, 2^1021400404 is an apocalyptic number.

It is an amenable number.

1021400404 is a deficient number, since it is larger than the sum of its proper divisors (865080710).

1021400404 is a wasteful number, since it uses less digits than its factorization.

1021400404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707383 (or 707362 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 1021400404 is about 31959.3555003852. The cubic root of 1021400404 is about 1007.0831781299.

Adding to 1021400404 its reverse (4040041201), we get a palindrome (5061441605).

The spelling of 1021400404 in words is "one billion, twenty-one million, four hundred thousand, four hundred four".