21282118 has 16 divisors (see below), whose sum is σ = 37504656. Its totient is φ = 8929440.

The previous prime is 21282103. The next prime is 21282127. The reversal of 21282118 is 81128212.

It is a junction number, because it is equal to n+sod(n) for n = 21282092 and 21282101.

It is a congruent number.

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, 36921 + ... + 37492.

It is an arithmetic number, because the mean of its divisors is an integer number (2344041).

Almost surely, 2^21282118 is an apocalyptic number.

21282118 is a deficient number, since it is larger than the sum of its proper divisors (16222538).

21282118 is a wasteful number, since it uses less digits than its factorization.

21282118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74439.

The product of its digits is 512, while the sum is 25.

The square root of 21282118 is about 4613.2545995208. The cubic root of 21282118 is about 277.1223898413.

The spelling of 21282118 in words is "twenty-one million, two hundred eighty-two thousand, one hundred eighteen".