1200111021031 has 16 divisors (see below), whose sum is σ = 1440476200800. Its totient is φ = 987755102208.

The previous prime is 1200111021029. The next prime is 1200111021041. The reversal of 1200111021031 is 1301201110021.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1200111021031 - 2¹ = 1200111021029 is a prime.

It is a super-2 number, since 2×1200111021031² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200111021041) 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, 142900186 + ... + 142908583.

It is an arithmetic number, because the mean of its divisors is an integer number (90029762550).

Almost surely, 2^{1200111021031} is an apocalyptic number.

1200111021031 is a deficient number, since it is larger than the sum of its proper divisors (240365179769).

1200111021031 is a wasteful number, since it uses less digits than its factorization.

1200111021031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285808818.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 1200111021031 its reverse (1301201110021), we get a palindrome (2501312131052).

The spelling of 1200111021031 in words is "one trillion, two hundred billion, one hundred eleven million, twenty-one thousand, thirty-one".