21111021113 has 16 divisors (see below), whose sum is σ = 25987038336. Its totient is φ = 16700497920.

The previous prime is 21111021101. The next prime is 21111021131. The reversal of 21111021113 is 31112011112.

It is a cyclic number.

It is not a de Polignac number, because 21111021113 - 2¹⁴ = 21111004729 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21111021133) 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 15 ways as a sum of consecutive naturals, for example, 683870 + ... + 714072.

It is an arithmetic number, because the mean of its divisors is an integer number (1624189896).

Almost surely, 2^21111021113 is an apocalyptic number.

It is an amenable number.

21111021113 is a deficient number, since it is larger than the sum of its proper divisors (4876017223).

21111021113 is a wasteful number, since it uses less digits than its factorization.

21111021113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37904.

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

Adding to 21111021113 its reverse (31112011112), we get a palindrome (52223032225).

The spelling of 21111021113 in words is "twenty-one billion, one hundred eleven million, twenty-one thousand, one hundred thirteen".