1021316004 has 72 divisors (see below), whose sum is σ = 2749088160. Its totient is φ = 318588672.

The previous prime is 1021316003. The next prime is 1021316011. The reversal of 1021316004 is 4006131201.

It is a happy number.

1021316004 is a `hidden beast` number, since 10 + 21 + 31 + 600 + 4 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (1021316003) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 104887 + ... + 114209.

It is an arithmetic number, because the mean of its divisors is an integer number (38181780).

Almost surely, 2^1021316004 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1021316004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1374544080).

1021316004 is an abundant number, since it is smaller than the sum of its proper divisors (1727772156).

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

1021316004 is a wasteful number, since it uses less digits than its factorization.

1021316004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9529 (or 9524 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1021316004 is about 31958.0350459787. The cubic root of 1021316004 is about 1007.0554383845.

Adding to 1021316004 its reverse (4006131201), we get a palindrome (5027447205).

The spelling of 1021316004 in words is "one billion, twenty-one million, three hundred sixteen thousand, four".