1200200020021 has 4 divisors (see below), whose sum is σ = 1200205748844. Its totient is φ = 1200194291200.

The previous prime is 1200200020007. The next prime is 1200200020027.

1200200020021 is nontrivially palindromic in base 10.

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 988244751025 + 211955268996 = 994105^2 + 460386^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200200020021 - 2¹⁷ = 1200199888949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200200020027) 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, 2537740 + ... + 2973301.

It is an arithmetic number, because the mean of its divisors is an integer number (300051437211).

Almost surely, 2^{1200200020021} is an apocalyptic number.

It is an amenable number.

1200200020021 is a deficient number, since it is larger than the sum of its proper divisors (5728823).

1200200020021 is an equidigital number, since it uses as much as digits as its factorization.

1200200020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5728822.

The product of its (nonzero) digits is 16, while the sum is 10.

It can be divided in two parts, 12002000 and 20021, that added together give a palindrome (12022021).

The spelling of 1200200020021 in words is "one trillion, two hundred billion, two hundred million, twenty thousand, twenty-one".