1021000000208 has 10 divisors (see below), whose sum is σ = 1978187500434. Its totient is φ = 510500000096.

The previous prime is 1021000000201. The next prime is 1021000000213. The reversal of 1021000000208 is 8020000001201.

It can be written as a sum of positive squares in only one way, i.e., 1020479795344 + 520204864 = 1010188^2 + 22808^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1021000000192 and 1021000000201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021000000201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31906249991 + ... + 31906250022.

Almost surely, 2^{1021000000208} is an apocalyptic number.

It is an amenable number.

1021000000208 is a deficient number, since it is larger than the sum of its proper divisors (957187500226).

1021000000208 is an equidigital number, since it uses as much as digits as its factorization.

1021000000208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63812500021 (or 63812500015 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1021000000208 its reverse (8020000001201), we get a palindrome (9041000001409).

The spelling of 1021000000208 in words is "one trillion, twenty-one billion, two hundred eight", and thus it is an aban number.