1200203543021 has 16 divisors (see below), whose sum is σ = 1461043858176. Its totient is φ = 962433620736.

The previous prime is 1200203542999. The next prime is 1200203543041. The reversal of 1200203543021 is 1203453020021.

It is not a de Polignac number, because 1200203543021 - 2²⁶ = 1200136434157 is a prime.

It is a super-2 number, since 2×1200203543021² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200203543041) 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 15 ways as a sum of consecutive naturals, for example, 30176966 + ... + 30216711.

It is an arithmetic number, because the mean of its divisors is an integer number (91315241136).

Almost surely, 2^{1200203543021} is an apocalyptic number.

It is an amenable number.

1200203543021 is a deficient number, since it is larger than the sum of its proper divisors (260840315155).

1200203543021 is a wasteful number, since it uses less digits than its factorization.

1200203543021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60393868.

The product of its (nonzero) digits is 1440, while the sum is 23.

Adding to 1200203543021 its reverse (1203453020021), we get a palindrome (2403656563042).

The spelling of 1200203543021 in words is "one trillion, two hundred billion, two hundred three million, five hundred forty-three thousand, twenty-one".