1200021210020 has 12 divisors (see below), whose sum is σ = 2520044541084. Its totient is φ = 480008484000.

The previous prime is 1200021209987. The next prime is 1200021210053. The reversal of 1200021210020 is 200121200021.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1200021209987) and next prime (1200021210053).

It can be written as a sum of positive squares in 2 ways, for example, as 122593817956 + 1077427392064 = 350134^2 + 1037992^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1200021209983 and 1200021210010.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30000530231 + ... + 30000530270.

It is an arithmetic number, because the mean of its divisors is an integer number (210003711757).

Almost surely, 2^{1200021210020} is an apocalyptic number.

1200021210020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1200021210020 is an abundant number, since it is smaller than the sum of its proper divisors (1320023331064).

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

1200021210020 is a wasteful number, since it uses less digits than its factorization.

1200021210020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60001060510 (or 60001060508 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 1200021210020 its reverse (200121200021), we get a palindrome (1400142410041).

Subtracting from 1200021210020 its reverse (200121200021), we obtain a palindrome (999900009999).

The spelling of 1200021210020 in words is "one trillion, two hundred billion, twenty-one million, two hundred ten thousand, twenty".