21111143511 has 8 divisors (see below), whose sum is σ = 28316744064. Its totient is φ = 13989819320.

The previous prime is 21111143503. The next prime is 21111143533. The reversal of 21111143511 is 11534111112.

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 21111143511 - 2³ = 21111143503 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111143551) 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 7 ways as a sum of consecutive naturals, for example, 21068505 + ... + 21069506.

It is an arithmetic number, because the mean of its divisors is an integer number (3539593008).

Almost surely, 2^21111143511 is an apocalyptic number.

21111143511 is a deficient number, since it is larger than the sum of its proper divisors (7205600553).

21111143511 is a wasteful number, since it uses less digits than its factorization.

21111143511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42138181.

The product of its digits is 120, while the sum is 21.

Adding to 21111143511 its reverse (11534111112), we get a palindrome (32645254623).

The spelling of 21111143511 in words is "twenty-one billion, one hundred eleven million, one hundred forty-three thousand, five hundred eleven".