21115469111 has 4 divisors (see below), whose sum is σ = 23035057224. Its totient is φ = 19195881000.

The previous prime is 21115469107. The next prime is 21115469117. The reversal of 21115469111 is 11196451112.

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 21115469111 - 2² = 21115469107 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 (21115469117) 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, 959794040 + ... + 959794061.

It is an arithmetic number, because the mean of its divisors is an integer number (5758764306).

Almost surely, 2^21115469111 is an apocalyptic number.

21115469111 is a deficient number, since it is larger than the sum of its proper divisors (1919588113).

21115469111 is a wasteful number, since it uses less digits than its factorization.

21115469111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1919588112.

The product of its digits is 2160, while the sum is 32.

The spelling of 21115469111 in words is "twenty-one billion, one hundred fifteen million, four hundred sixty-nine thousand, one hundred eleven".