21111119278 has 8 divisors (see below), whose sum is σ = 31816758600. Its totient is φ = 10505533080.

The previous prime is 21111119209. The next prime is 21111119321. The reversal of 21111119278 is 87291111112.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25012753 + ... + 25013596.

It is an arithmetic number, because the mean of its divisors is an integer number (3977094825).

Almost surely, 2^21111119278 is an apocalyptic number.

21111119278 is a deficient number, since it is larger than the sum of its proper divisors (10705639322).

21111119278 is a wasteful number, since it uses less digits than its factorization.

21111119278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50026562.

The product of its digits is 2016, while the sum is 34.

The spelling of 21111119278 in words is "twenty-one billion, one hundred eleven million, one hundred nineteen thousand, two hundred seventy-eight".