1111221201031 has 2 divisors, whose sum is σ = 1111221201032. Its totient is φ = 1111221201030.

The previous prime is 1111221201029. The next prime is 1111221201047. The reversal of 1111221201031 is 1301021221111.

It is a happy number.

It is an a-pointer prime, because the next prime (1111221201047) can be obtained adding 1111221201031 to its sum of digits (16).

It is a weak prime.

It is an emirp because it is prime and its reverse (1301021221111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1111221201031 - 2¹ = 1111221201029 is a prime.

It is a super-2 number, since 2×1111221201031² (a number of 25 digits) contains 22 as substring.

Together with 1111221201029, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1111221200996 and 1111221201014.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1111221201331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555610600515 + 555610600516.

It is an arithmetic number, because the mean of its divisors is an integer number (555610600516).

Almost surely, 2^{1111221201031} is an apocalyptic number.

1111221201031 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111221201031 is an equidigital number, since it uses as much as digits as its factorization.

1111221201031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 1111221201031 its reverse (1301021221111), we get a palindrome (2412242422142).

The spelling of 1111221201031 in words is "one trillion, one hundred eleven billion, two hundred twenty-one million, two hundred one thousand, thirty-one".