21270108 has 24 divisors (see below), whose sum is σ = 51342480. Its totient is φ = 6845440.

The previous prime is 21270089. The next prime is 21270113. The reversal of 21270108 is 80107212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30213 + ... + 30908.

It is an arithmetic number, because the mean of its divisors is an integer number (2139270).

Almost surely, 2^21270108 is an apocalyptic number.

It is an amenable number.

21270108 is an abundant number, since it is smaller than the sum of its proper divisors (30072372).

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

21270108 is a wasteful number, since it uses less digits than its factorization.

21270108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61157 (or 61155 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 21270108 is about 4611.9527317612. The cubic root of 21270108 is about 277.0702511370.

The spelling of 21270108 in words is "twenty-one million, two hundred seventy thousand, one hundred eight".