11111110221131 has 2 divisors, whose sum is σ = 11111110221132. Its totient is φ = 11111110221130.

The previous prime is 11111110221091. The next prime is 11111110221137. The reversal of 11111110221131 is 13112201111111.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11111110221131 is a prime.

It is a super-2 number, since 2×11111110221131² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11111110221137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5555555110565 + 5555555110566.

It is an arithmetic number, because the mean of its divisors is an integer number (5555555110566).

Almost surely, 2^{11111110221131} is an apocalyptic number.

11111110221131 is a deficient number, since it is larger than the sum of its proper divisors (1).

11111110221131 is an equidigital number, since it uses as much as digits as its factorization.

11111110221131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 17.

Adding to 11111110221131 its reverse (13112201111111), we get a palindrome (24223311332242).

The spelling of 11111110221131 in words is "eleven trillion, one hundred eleven billion, one hundred ten million, two hundred twenty-one thousand, one hundred thirty-one".