2001021322120 has 32 divisors (see below), whose sum is σ = 4502367610200. Its totient is φ = 800396149248.

The previous prime is 2001021322093. The next prime is 2001021322121. The reversal of 2001021322120 is 212231201002.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 639734427556 + 1361286894564 = 799834^2 + 1166742^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2001021322094 and 2001021322103.

It is not an unprimeable number, because it can be changed into a prime (2001021322121) 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, 2497102 + ... + 3199618.

Almost surely, 2^{2001021322120} is an apocalyptic number.

2001021322120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2001021322120 is an abundant number, since it is smaller than the sum of its proper divisors (2501346288080).

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

2001021322120 is a wasteful number, since it uses less digits than its factorization.

2001021322120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 773737 (or 773733 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 2001021322120 its reverse (212231201002), we get a palindrome (2213252523122).

The spelling of 2001021322120 in words is "two trillion, one billion, twenty-one million, three hundred twenty-two thousand, one hundred twenty".