1021242640 has 40 divisors (see below), whose sum is σ = 2590244928. Its totient is φ = 371360640.

The previous prime is 1021242611. The next prime is 1021242667. The reversal of 1021242640 is 462421201.

It is a happy number.

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 (22).

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, 579372 + ... + 581131.

Almost surely, 2^1021242640 is an apocalyptic number.

1021242640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021242640 is an abundant number, since it is smaller than the sum of its proper divisors (1569002288).

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

1021242640 is a wasteful number, since it uses less digits than its factorization.

1021242640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1160527 (or 1160521 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 1021242640 is about 31956.8872076114. The cubic root of 1021242640 is about 1007.0313245993.

Adding to 1021242640 its reverse (462421201), we get a palindrome (1483663841).

The spelling of 1021242640 in words is "one billion, twenty-one million, two hundred forty-two thousand, six hundred forty".