1321020004 has 6 divisors (see below), whose sum is σ = 2311785014. Its totient is φ = 660510000.

The previous prime is 1321019963. The next prime is 1321020013. The reversal of 1321020004 is 4000201231.

It can be written as a sum of positive squares in only one way, i.e., 1296000000 + 25020004 = 36000^2 + 5002^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165127497 + ... + 165127504.

Almost surely, 2^1321020004 is an apocalyptic number.

It is an amenable number.

1321020004 is a deficient number, since it is larger than the sum of its proper divisors (990765010).

1321020004 is a wasteful number, since it uses less digits than its factorization.

1321020004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330255005 (or 330255003 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 1321020004 is about 36345.8388815006. The cubic root of 1321020004 is about 1097.2437894876.

Adding to 1321020004 its reverse (4000201231), we get a palindrome (5321221235).

The spelling of 1321020004 in words is "one billion, three hundred twenty-one million, twenty thousand, four".