21108426 has 16 divisors (see below), whose sum is σ = 43358304. Its totient is φ = 6845904.

The previous prime is 21108419. The next prime is 21108431. The reversal of 21108426 is 62480112.

It is a junction number, because it is equal to n+sod(n) for n = 21108396 and 21108405.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47320 + ... + 47763.

It is an arithmetic number, because the mean of its divisors is an integer number (2709894).

Almost surely, 2^21108426 is an apocalyptic number.

21108426 is an abundant number, since it is smaller than the sum of its proper divisors (22249878).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21108426 is a wasteful number, since it uses less digits than its factorization.

21108426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95125.

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 21108426 is about 4594.3907104207. The cubic root of 21108426 is about 276.3664267679.

Adding to 21108426 its reverse (62480112), we get a palindrome (83588538).

The spelling of 21108426 in words is "twenty-one million, one hundred eight thousand, four hundred twenty-six".