1021281973208 has 16 divisors (see below), whose sum is σ = 2188461371280. Its totient is φ = 437692274208.

The previous prime is 1021281973163. The next prime is 1021281973237. The reversal of 1021281973208 is 8023791821201.

It is a super-2 number, since 2×1021281973208² (a number of 25 digits) contains 22 as substring.

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, 9118588991 + ... + 9118589102.

It is an arithmetic number, because the mean of its divisors is an integer number (136778835705).

Almost surely, 2^{1021281973208} is an apocalyptic number.

It is an amenable number.

1021281973208 is an abundant number, since it is smaller than the sum of its proper divisors (1167179398072).

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

1021281973208 is a wasteful number, since it uses less digits than its factorization.

1021281973208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18237178106 (or 18237178102 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 44.

The spelling of 1021281973208 in words is "one trillion, twenty-one billion, two hundred eighty-one million, nine hundred seventy-three thousand, two hundred eight".