1021440204 has 144 divisors (see below), whose sum is σ = 2835006720. Its totient is φ = 309173760.

The previous prime is 1021440193. The next prime is 1021440227. The reversal of 1021440204 is 4020441201.

1021440204 is a `hidden beast` number, since 1 + 0 + 21 + 440 + 204 = 666.

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

It is a zygodrome in base 2.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1197042 + ... + 1197894.

Almost surely, 2^1021440204 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 1021440204, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1417503360).

1021440204 is an abundant number, since it is smaller than the sum of its proper divisors (1813566516).

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

1021440204 is a wasteful number, since it uses less digits than its factorization.

1021440204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 960 (or 955 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 1021440204 is about 31959.9781601928. The cubic root of 1021440204 is about 1007.0962586645.

Adding to 1021440204 its reverse (4020441201), we get a palindrome (5041881405).

The spelling of 1021440204 in words is "one billion, twenty-one million, four hundred forty thousand, two hundred four".