1021000636 has 24 divisors (see below), whose sum is σ = 1865614464. Its totient is φ = 487996080.

The previous prime is 1021000633. The next prime is 1021000697. The reversal of 1021000636 is 6360001201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021000633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 219511 + ... + 224113.

It is an arithmetic number, because the mean of its divisors is an integer number (77733936).

Almost surely, 2^1021000636 is an apocalyptic number.

It is an amenable number.

1021000636 is a deficient number, since it is larger than the sum of its proper divisors (844613828).

1021000636 is a wasteful number, since it uses less digits than its factorization.

1021000636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7041 (or 7039 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 1021000636 is about 31953.1005694283. The cubic root of 1021000636 is about 1006.9517728676.

Adding to 1021000636 its reverse (6360001201), we get a palindrome (7381001837).

The spelling of 1021000636 in words is "one billion, twenty-one million, six hundred thirty-six", and thus it is an aban number.