1321124004 has 36 divisors (see below), whose sum is σ = 3402522396. Its totient is φ = 432065088.

The previous prime is 1321123939. The next prime is 1321124027. The reversal of 1321124004 is 4004211231.

It can be written as a sum of positive squares in 2 ways, for example, as 570254400 + 750869604 = 23880^2 + 27402^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 344299 + ... + 348114.

It is an arithmetic number, because the mean of its divisors is an integer number (94514511).

Almost surely, 2^1321124004 is an apocalyptic number.

It is an amenable number.

1321124004 is an abundant number, since it is smaller than the sum of its proper divisors (2081398392).

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

1321124004 is a wasteful number, since it uses less digits than its factorization.

1321124004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 692476 (or 692471 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 1321124004 is about 36347.2695535717. The cubic root of 1321124004 is about 1097.2725829854.

Adding to 1321124004 its reverse (4004211231), we get a palindrome (5325335235).

The spelling of 1321124004 in words is "one billion, three hundred twenty-one million, one hundred twenty-four thousand, four".