21110121131 has 12 divisors (see below), whose sum is σ = 23273832792. Its totient is φ = 19133004000.

The previous prime is 21110121101. The next prime is 21110121139. The reversal of 21110121131 is 13112101112.

It is not a de Polignac number, because 21110121131 - 2²² = 21105926827 is a prime.

It is a super-2 number, since 2×21110121131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21110121139) 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 in 11 ways as a sum of consecutive naturals, for example, 223490 + ... + 303591.

It is an arithmetic number, because the mean of its divisors is an integer number (1939486066).

Almost surely, 2^21110121131 is an apocalyptic number.

21110121131 is a deficient number, since it is larger than the sum of its proper divisors (2163711661).

21110121131 is a wasteful number, since it uses less digits than its factorization.

21110121131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 527434 (or 527423 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 14.

Adding to 21110121131 its reverse (13112101112), we get a palindrome (34222222243).

It can be divided in two parts, 211101 and 21131, that added together give a palindrome (232232).

The spelling of 21110121131 in words is "twenty-one billion, one hundred ten million, one hundred twenty-one thousand, one hundred thirty-one".