21110919 has 24 divisors (see below), whose sum is σ = 30156912. Its totient is φ = 13132800.

The previous prime is 21110917. The next prime is 21110953. The reversal of 21110919 is 91901112.

It is not a de Polignac number, because 21110919 - 2¹ = 21110917 is a prime.

It is a super-2 number, since 2×21110919² = 891341802049122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110917) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 109287 + ... + 109479.

It is an arithmetic number, because the mean of its divisors is an integer number (1256538).

Almost surely, 2^21110919 is an apocalyptic number.

21110919 is a deficient number, since it is larger than the sum of its proper divisors (9045993).

21110919 is a wasteful number, since it uses less digits than its factorization.

21110919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335 (or 316 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 24.

The square root of 21110919 is about 4594.6620115086. The cubic root of 21110919 is about 276.3773063787.

The spelling of 21110919 in words is "twenty-one million, one hundred ten thousand, nine hundred nineteen".