1021242440 has 32 divisors (see below), whose sum is σ = 2299709880. Its totient is φ = 408156672.

The previous prime is 1021242437. The next prime is 1021242463. The reversal of 1021242440 is 442421201.

It can be written as a sum of positive squares in 4 ways, for example, as 909263716 + 111978724 = 30154^2 + 10582^2 .

It is a super-2 number, since 2×1021242440² = 2085872242514307200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41084 + ... + 61076.

Almost surely, 2^1021242440 is an apocalyptic number.

1021242440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021242440 is an abundant number, since it is smaller than the sum of its proper divisors (1278467440).

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

1021242440 is a wasteful number, since it uses less digits than its factorization.

1021242440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21281 (or 21277 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 1021242440 is about 31956.8840783954. The cubic root of 1021242440 is about 1007.0312588603.

Adding to 1021242440 its reverse (442421201), we get a palindrome (1463663641).

The spelling of 1021242440 in words is "one billion, twenty-one million, two hundred forty-two thousand, four hundred forty".