1011021004 has 48 divisors (see below), whose sum is σ = 2115989568. Its totient is φ = 413607168.

The previous prime is 1011021001. The next prime is 1011021007. The reversal of 1011021004 is 4001201101.

1011021004 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (1011021001) and next prime (1011021007).

It is not an unprimeable number, because it can be changed into a prime (1011021001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45702 + ... + 64114.

It is an arithmetic number, because the mean of its divisors is an integer number (44083116).

Almost surely, 2^1011021004 is an apocalyptic number.

1011021004 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1011021004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1057994784).

1011021004 is an abundant number, since it is smaller than the sum of its proper divisors (1104968564).

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

1011021004 is a wasteful number, since it uses less digits than its factorization.

1011021004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18514 (or 18512 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 1011021004 is about 31796.5564802228. The cubic root of 1011021004 is about 1003.6602541932.

Adding to 1011021004 its reverse (4001201101), we get a palindrome (5012222105).

The spelling of 1011021004 in words is "one billion, eleven million, twenty-one thousand, four".