21111043113 has 24 divisors (see below), whose sum is σ = 31215220608. Its totient is φ = 13741291872.

The previous prime is 21111043103. The next prime is 21111043133. The reversal of 21111043113 is 31134011112.

It is a happy number.

21111043113 is a `hidden beast` number, since 211 + 1 + 10 + 431 + 13 = 666.

It is not a de Polignac number, because 21111043113 - 2⁸ = 21111042857 is a prime.

It is a super-2 number, since 2×21111043113² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21111043103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1123431 + ... + 1142067.

It is an arithmetic number, because the mean of its divisors is an integer number (1300634192).

Almost surely, 2^21111043113 is an apocalyptic number.

It is an amenable number.

21111043113 is a deficient number, since it is larger than the sum of its proper divisors (10104177495).

21111043113 is a wasteful number, since it uses less digits than its factorization.

21111043113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21613 (or 21610 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 21111043113 its reverse (31134011112), we get a palindrome (52245054225).

The spelling of 21111043113 in words is "twenty-one billion, one hundred eleven million, forty-three thousand, one hundred thirteen".