1201321330020 has 144 divisors (see below), whose sum is σ = 4187590138368. Its totient is φ = 273070621440.

The previous prime is 1201321329983. The next prime is 1201321330061. The reversal of 1201321330020 is 200331231021.

1201321330020 is a `hidden beast` number, since 1 + 20 + 1 + 321 + 3 + 300 + 20 = 666.

It is a super-2 number, since 2×1201321330020² (a number of 25 digits) contains 22 as substring.

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 = 1201321329975 and 1201321330002.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2405724 + ... + 2861843.

It is an arithmetic number, because the mean of its divisors is an integer number (29080487072).

Almost surely, 2^{1201321330020} is an apocalyptic number.

1201321330020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1201321330020 is an abundant number, since it is smaller than the sum of its proper divisors (2986268808348).

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

1201321330020 is a wasteful number, since it uses less digits than its factorization.

1201321330020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5267770 (or 5267765 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 1201321330020 its reverse (200331231021), we get a palindrome (1401652561041).

The spelling of 1201321330020 in words is "one trillion, two hundred one billion, three hundred twenty-one million, three hundred thirty thousand, twenty".