1021210012008 has 48 divisors (see below), whose sum is σ = 2766728448900. Its totient is φ = 340286250240.

The previous prime is 1021210012003. The next prime is 1021210012019. The reversal of 1021210012008 is 8002100121201.

1021210012008 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 775037251044 + 246172760964 = 880362^2 + 496158^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (1021210012001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2228413 + ... + 2647308.

Almost surely, 2^{1021210012008} is an apocalyptic number.

1021210012008 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1021210012008 is an abundant number, since it is smaller than the sum of its proper divisors (1745518436892).

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

1021210012008 is a wasteful number, since it uses less digits than its factorization.

1021210012008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4878642 (or 4878635 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1021210012008 its reverse (8002100121201), we get a palindrome (9023310133209).

The spelling of 1021210012008 in words is "one trillion, twenty-one billion, two hundred ten million, twelve thousand, eight".