1020939393921 has 16 divisors (see below), whose sum is σ = 1369163652480. Its totient is φ = 676679541120.

The previous prime is 1020939393883. The next prime is 1020939393959. The reversal of 1020939393921 is 1293939390201.

It is an interprime number because it is at equal distance from previous prime (1020939393883) and next prime (1020939393959).

It is a de Polignac number, because none of the positive numbers 2^k-1020939393921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1020939393961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 642781 + ... + 1566858.

It is an arithmetic number, because the mean of its divisors is an integer number (85572728280).

Almost surely, 2^{1020939393921} is an apocalyptic number.

It is an amenable number.

1020939393921 is a deficient number, since it is larger than the sum of its proper divisors (348224258559).

1020939393921 is a wasteful number, since it uses less digits than its factorization.

1020939393921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2210536.

The product of its (nonzero) digits is 708588, while the sum is 51.

The spelling of 1020939393921 in words is "one trillion, twenty billion, nine hundred thirty-nine million, three hundred ninety-three thousand, nine hundred twenty-one".