1100203121031 has 48 divisors (see below), whose sum is σ = 1716065586144. Its totient is φ = 625147600896.

The previous prime is 1100203121023. The next prime is 1100203121051. The reversal of 1100203121031 is 1301213020011.

It is a happy number.

It is not a de Polignac number, because 1100203121031 - 2³ = 1100203121023 is a prime.

It is a super-2 number, since 2×1100203121031² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1100203121031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1100203121051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 25906791 + ... + 25949223.

It is an arithmetic number, because the mean of its divisors is an integer number (35751366378).

Almost surely, 2^{1100203121031} is an apocalyptic number.

1100203121031 is a deficient number, since it is larger than the sum of its proper divisors (615862465113).

1100203121031 is a wasteful number, since it uses less digits than its factorization.

1100203121031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43440 (or 43433 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 1100203121031 its reverse (1301213020011), we get a palindrome (2401416141042).

The spelling of 1100203121031 in words is "one trillion, one hundred billion, two hundred three million, one hundred twenty-one thousand, thirty-one".