11111212021031 has 2 divisors, whose sum is σ = 11111212021032. Its totient is φ = 11111212021030.

The previous prime is 11111212020983. The next prime is 11111212021033. The reversal of 11111212021031 is 13012021211111.

11111212021031 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11111212021031 is a prime.

It is a super-2 number, since 2×11111212021031² (a number of 27 digits) contains 22 as substring.

Together with 11111212021033, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11111212021033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5555606010515 + 5555606010516.

It is an arithmetic number, because the mean of its divisors is an integer number (5555606010516).

Almost surely, 2^{11111212021031} is an apocalyptic number.

11111212021031 is a deficient number, since it is larger than the sum of its proper divisors (1).

11111212021031 is an equidigital number, since it uses as much as digits as its factorization.

11111212021031 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 17.

Adding to 11111212021031 its reverse (13012021211111), we get a palindrome (24123233232142).

The spelling of 11111212021031 in words is "eleven trillion, one hundred eleven billion, two hundred twelve million, twenty-one thousand, thirty-one".