21121110011 has 4 divisors (see below), whose sum is σ = 22232747400. Its totient is φ = 20009472624.

The previous prime is 21121109923. The next prime is 21121110037. The reversal of 21121110011 is 11001112112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21121110011 - 2¹⁴ = 21121093627 is a prime.

It is a super-2 number, since 2×21121110011² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21121109974 and 21121110001.

It is not an unprimeable number, because it can be changed into a prime (21121110041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 555818666 + ... + 555818703.

It is an arithmetic number, because the mean of its divisors is an integer number (5558186850).

Almost surely, 2^21121110011 is an apocalyptic number.

21121110011 is a deficient number, since it is larger than the sum of its proper divisors (1111637389).

21121110011 is a wasteful number, since it uses less digits than its factorization.

21121110011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1111637388.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 21121110011 its reverse (11001112112), we get a palindrome (32122222123).

The spelling of 21121110011 in words is "twenty-one billion, one hundred twenty-one million, one hundred ten thousand, eleven".