1021223440 has 20 divisors (see below), whose sum is σ = 2374344684. Its totient is φ = 408489344.

The previous prime is 1021223363. The next prime is 1021223471. The reversal of 1021223440 is 443221201.

It can be written as a sum of positive squares in 2 ways, for example, as 281165824 + 740057616 = 16768^2 + 27204^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6382567 + ... + 6382726.

Almost surely, 2^1021223440 is an apocalyptic number.

1021223440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021223440 is an abundant number, since it is smaller than the sum of its proper divisors (1353121244).

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

1021223440 is a wasteful number, since it uses less digits than its factorization.

1021223440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12765306 (or 12765300 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 1021223440 is about 31956.5868014718. The cubic root of 1021223440 is about 1007.0250136202.

Adding to 1021223440 its reverse (443221201), we get a palindrome (1464444641).

The spelling of 1021223440 in words is "one billion, twenty-one million, two hundred twenty-three thousand, four hundred forty".