1021318793851 has 8 divisors (see below), whose sum is σ = 1100074099520. Its totient is φ = 945063656712.

The previous prime is 1021318793849. The next prime is 1021318793861. The reversal of 1021318793851 is 1583978131201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1021318793851 - 2¹ = 1021318793849 is a prime.

It is a super-2 number, since 2×1021318793851² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1021318793795 and 1021318793804.

It is not an unprimeable number, because it can be changed into a prime (1021318793861) 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, 625041285 + ... + 625042918.

It is an arithmetic number, because the mean of its divisors is an integer number (137509262440).

Almost surely, 2^{1021318793851} is an apocalyptic number.

1021318793851 is a deficient number, since it is larger than the sum of its proper divisors (78755305669).

1021318793851 is a wasteful number, since it uses less digits than its factorization.

1021318793851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1250084265.

The product of its (nonzero) digits is 362880, while the sum is 49.

The spelling of 1021318793851 in words is "one trillion, twenty-one billion, three hundred eighteen million, seven hundred ninety-three thousand, eight hundred fifty-one".