21280108 has 6 divisors (see below), whose sum is σ = 37240196. Its totient is φ = 10640052.

The previous prime is 21280099. The next prime is 21280117. The reversal of 21280108 is 80108212.

It is an interprime number because it is at equal distance from previous prime (21280099) and next prime (21280117).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2660010 + ... + 2660017.

Almost surely, 2^21280108 is an apocalyptic number.

It is an amenable number.

21280108 is a deficient number, since it is larger than the sum of its proper divisors (15960088).

21280108 is a wasteful number, since it uses less digits than its factorization.

21280108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5320031 (or 5320029 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 22.

The square root of 21280108 is about 4613.0367438381. The cubic root of 21280108 is about 277.1136652469.

The spelling of 21280108 in words is "twenty-one million, two hundred eighty thousand, one hundred eight".