1002020200121 has 4 divisors (see below), whose sum is σ = 1060962564852. Its totient is φ = 943077835392.

The previous prime is 1002020200117. The next prime is 1002020200151. The reversal of 1002020200121 is 1210020202001.

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 904011132025 + 98009068096 = 950795^2 + 313064^2 .

It is a cyclic number.

It is not a de Polignac number, because 1002020200121 - 2² = 1002020200117 is a prime.

It is a super-3 number, since 3×1002020200121³ (a number of 37 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1002020200151) 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, 29471182340 + ... + 29471182373.

It is an arithmetic number, because the mean of its divisors is an integer number (265240641213).

Almost surely, 2^{1002020200121} is an apocalyptic number.

It is an amenable number.

1002020200121 is a deficient number, since it is larger than the sum of its proper divisors (58942364731).

1002020200121 is an equidigital number, since it uses as much as digits as its factorization.

1002020200121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58942364730.

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

Adding to 1002020200121 its reverse (1210020202001), we get a palindrome (2212040402122).

The spelling of 1002020200121 in words is "one trillion, two billion, twenty million, two hundred thousand, one hundred twenty-one".