21111418 has 8 divisors (see below), whose sum is σ = 31729248. Its totient is φ = 10535004.

The previous prime is 21111397. The next prime is 21111457. The reversal of 21111418 is 81411112.

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

It is a junction number, because it is equal to n+sod(n) for n = 21111395 and 21111404.

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, 9046 + ... + 11137.

It is an arithmetic number, because the mean of its divisors is an integer number (3966156).

Almost surely, 2^21111418 is an apocalyptic number.

21111418 is a deficient number, since it is larger than the sum of its proper divisors (10617830).

21111418 is a wasteful number, since it uses less digits than its factorization.

21111418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20708.

The product of its digits is 64, while the sum is 19.

The square root of 21111418 is about 4594.7163133321. The cubic root of 21111418 is about 276.3794839437.

The spelling of 21111418 in words is "twenty-one million, one hundred eleven thousand, four hundred eighteen".