1021063640 has 16 divisors (see below), whose sum is σ = 2297393280. Its totient is φ = 408425440.

The previous prime is 1021063621. The next prime is 1021063663. The reversal of 1021063640 is 463601201.

It is a happy number.

It is a congruent number.

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, 12763256 + ... + 12763335.

It is an arithmetic number, because the mean of its divisors is an integer number (143587080).

Almost surely, 2^1021063640 is an apocalyptic number.

1021063640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021063640 is an abundant number, since it is smaller than the sum of its proper divisors (1276329640).

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

1021063640 is a wasteful number, since it uses less digits than its factorization.

1021063640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25526602 (or 25526598 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 1021063640 is about 31954.0864366359. The cubic root of 1021063640 is about 1006.9724847987.

Adding to 1021063640 its reverse (463601201), we get a palindrome (1484664841).

The spelling of 1021063640 in words is "one billion, twenty-one million, sixty-three thousand, six hundred forty".