1200202012021 has 4 divisors (see below), whose sum is σ = 1201386812652. Its totient is φ = 1199017211392.

The previous prime is 1200202012013. The next prime is 1200202012027. The reversal of 1200202012021 is 1202102020021.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 288196111921 + 912005900100 = 536839^2 + 954990^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200202012021 - 2³ = 1200202012013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1200202011992 and 1200202012010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200202012027) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 592398796 + ... + 592400821.

It is an arithmetic number, because the mean of its divisors is an integer number (300346703163).

Almost surely, 2^{1200202012021} is an apocalyptic number.

It is an amenable number.

1200202012021 is a deficient number, since it is larger than the sum of its proper divisors (1184800631).

1200202012021 is a wasteful number, since it uses less digits than its factorization.

1200202012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1184800630.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 1200202012021 its reverse (1202102020021), we get a palindrome (2402304032042).

The spelling of 1200202012021 in words is "one trillion, two hundred billion, two hundred two million, twelve thousand, twenty-one".