21330121111 has 8 divisors (see below), whose sum is σ = 23294434464. Its totient is φ = 19412027040.

The previous prime is 21330121091. The next prime is 21330121121. The reversal of 21330121111 is 11112103312.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21330121111 - 2⁹ = 21330120599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21330121121) 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 7 ways as a sum of consecutive naturals, for example, 11553856 + ... + 11555701.

It is an arithmetic number, because the mean of its divisors is an integer number (2911804308).

Almost surely, 2^21330121111 is an apocalyptic number.

21330121111 is a deficient number, since it is larger than the sum of its proper divisors (1964313353).

21330121111 is a wasteful number, since it uses less digits than its factorization.

21330121111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23109641.

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

Adding to 21330121111 its reverse (11112103312), we get a palindrome (32442224423).

The spelling of 21330121111 in words is "twenty-one billion, three hundred thirty million, one hundred twenty-one thousand, one hundred eleven".