21111302113 has 16 divisors (see below), whose sum is σ = 23183496000. Its totient is φ = 19065026880.

The previous prime is 21111302111. The next prime is 21111302129. The reversal of 21111302113 is 31120311112.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21111302113 - 2¹ = 21111302111 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21111302111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1022470 + ... + 1042912.

It is an arithmetic number, because the mean of its divisors is an integer number (1448968500).

Almost surely, 2^21111302113 is an apocalyptic number.

It is an amenable number.

21111302113 is a deficient number, since it is larger than the sum of its proper divisors (2072193887).

21111302113 is a wasteful number, since it uses less digits than its factorization.

21111302113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21072.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 21111302113 its reverse (31120311112), we get a palindrome (52231613225).

The spelling of 21111302113 in words is "twenty-one billion, one hundred eleven million, three hundred two thousand, one hundred thirteen".