21110001131 has 2 divisors, whose sum is σ = 21110001132. Its totient is φ = 21110001130.

The previous prime is 21110001103. The next prime is 21110001139. The reversal of 21110001131 is 13110001112.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21110001131 is a prime.

It is a super-2 number, since 2×21110001131² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21110001139) 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 as a sum of consecutive naturals, namely, 10555000565 + 10555000566.

It is an arithmetic number, because the mean of its divisors is an integer number (10555000566).

Almost surely, 2^21110001131 is an apocalyptic number.

21110001131 is a deficient number, since it is larger than the sum of its proper divisors (1).

21110001131 is an equidigital number, since it uses as much as digits as its factorization.

21110001131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6, while the sum is 11.

Adding to 21110001131 its reverse (13110001112), we get a palindrome (34220002243).

The spelling of 21110001131 in words is "twenty-one billion, one hundred ten million, one thousand, one hundred thirty-one".