1200021312020 has 48 divisors (see below), whose sum is σ = 2559750294528. Its totient is φ = 472467851520.

The previous prime is 1200021312013. The next prime is 1200021312059. The reversal of 1200021312020 is 202131200021.

It is a happy number.

It is a super-2 number, since 2×1200021312020² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1200021311986 and 1200021312004.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 165824 + ... + 1558056.

It is an arithmetic number, because the mean of its divisors is an integer number (53328131136).

Almost surely, 2^{1200021312020} is an apocalyptic number.

1200021312020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1200021312020 is an abundant number, since it is smaller than the sum of its proper divisors (1359728982508).

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

1200021312020 is a wasteful number, since it uses less digits than its factorization.

1200021312020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1392920 (or 1392918 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 1200021312020 its reverse (202131200021), we get a palindrome (1402152512041).

The spelling of 1200021312020 in words is "one trillion, two hundred billion, twenty-one million, three hundred twelve thousand, twenty".