21115367111 has 8 divisors (see below), whose sum is σ = 21474201984. Its totient is φ = 20757817080.

The previous prime is 21115367093. The next prime is 21115367113. The reversal of 21115367111 is 11176351112.

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 21115367111 - 2²² = 21111172807 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 (21115367113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 288035 + ... + 353828.

It is an arithmetic number, because the mean of its divisors is an integer number (2684275248).

Almost surely, 2^21115367111 is an apocalyptic number.

21115367111 is a deficient number, since it is larger than the sum of its proper divisors (358834873).

21115367111 is an equidigital number, since it uses as much as digits as its factorization.

21115367111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642421.

The product of its digits is 1260, while the sum is 29.

The spelling of 21115367111 in words is "twenty-one billion, one hundred fifteen million, three hundred sixty-seven thousand, one hundred eleven".