21110001113 has 4 divisors (see below), whose sum is σ = 21167521920. Its totient is φ = 21052480308.

The previous prime is 21110001103. The next prime is 21110001131. The reversal of 21110001113 is 31110001112.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21110001113 - 2¹² = 21109997017 is a prime.

It is a super-2 number, since 2×21110001113² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21110001094 and 21110001103.

It is not an unprimeable number, because it can be changed into a prime (21110001103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28759853 + ... + 28760586.

It is an arithmetic number, because the mean of its divisors is an integer number (5291880480).

Almost surely, 2^21110001113 is an apocalyptic number.

It is an amenable number.

21110001113 is a deficient number, since it is larger than the sum of its proper divisors (57520807).

21110001113 is an equidigital number, since it uses as much as digits as its factorization.

21110001113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57520806.

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

Adding to 21110001113 its reverse (31110001112), we get a palindrome (52220002225).

Subtracting 21110001113 from its reverse (31110001112), we obtain a palindrome (9999999999).

The spelling of 21110001113 in words is "twenty-one billion, one hundred ten million, one thousand, one hundred thirteen".