1021244240 has 40 divisors (see below), whose sum is σ = 2377431168. Its totient is φ = 407975040.

The previous prime is 1021244207. The next prime is 1021244261. The reversal of 1021244240 is 424421201.

It is a tau number, because it is divible by the number of its divisors (40).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58085 + ... + 73595.

Almost surely, 2^1021244240 is an apocalyptic number.

1021244240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021244240 is an abundant number, since it is smaller than the sum of its proper divisors (1356186928).

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

1021244240 is a wasteful number, since it uses less digits than its factorization.

1021244240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16347 (or 16341 counting only the distinct ones).

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

The square root of 1021244240 is about 31956.9122413289. The cubic root of 1021244240 is about 1007.0318505106.

Adding to 1021244240 its reverse (424421201), we get a palindrome (1445665441).

The spelling of 1021244240 in words is "one billion, twenty-one million, two hundred forty-four thousand, two hundred forty".