21111312119 has 4 divisors (see below), whose sum is σ = 21111607440. Its totient is φ = 21111016800.

The previous prime is 21111312073. The next prime is 21111312127. The reversal of 21111312119 is 91121311112.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21111312119 is a prime.

It is a super-2 number, since 2×21111312119² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21111312094 and 21111312103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111312919) 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, 34367 + ... + 208335.

It is an arithmetic number, because the mean of its divisors is an integer number (5277901860).

Almost surely, 2^21111312119 is an apocalyptic number.

21111312119 is a deficient number, since it is larger than the sum of its proper divisors (295321).

21111312119 is a wasteful number, since it uses less digits than its factorization.

21111312119 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295320.

The product of its digits is 108, while the sum is 23.

The spelling of 21111312119 in words is "twenty-one billion, one hundred eleven million, three hundred twelve thousand, one hundred nineteen".