1021320121320 has 64 divisors (see below), whose sum is σ = 3404400408000. Its totient is φ = 272352032064.

The previous prime is 1021320121291. The next prime is 1021320121379. The reversal of 1021320121320 is 231210231201.

1021320121320 is a `hidden beast` number, since 1 + 0 + 2 + 1 + 320 + 1 + 21 + 320 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 1021320121293 and 1021320121302.

It is an unprimeable number.

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, 472832310 + ... + 472834469.

It is an arithmetic number, because the mean of its divisors is an integer number (53193756375).

Almost surely, 2^{1021320121320} is an apocalyptic number.

1021320121320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021320121320 is an abundant number, since it is smaller than the sum of its proper divisors (2383080286680).

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

1021320121320 is a wasteful number, since it uses less digits than its factorization.

1021320121320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 945666799 (or 945666789 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 1021320121320 its reverse (231210231201), we get a palindrome (1252530352521).

The spelling of 1021320121320 in words is "one trillion, twenty-one billion, three hundred twenty million, one hundred twenty-one thousand, three hundred twenty".