21297108 has 24 divisors (see below), whose sum is σ = 56792512. Its totient is φ = 6084864.

The previous prime is 21297071. The next prime is 21297109. The reversal of 21297108 is 80179212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21297109) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126685 + ... + 126852.

Almost surely, 2^21297108 is an apocalyptic number.

21297108 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21297108 is an abundant number, since it is smaller than the sum of its proper divisors (35495404).

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

21297108 is a wasteful number, since it uses less digits than its factorization.

21297108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253551 (or 253549 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 21297108 is about 4614.8789799950. The cubic root of 21297108 is about 277.1874380303.

The spelling of 21297108 in words is "twenty-one million, two hundred ninety-seven thousand, one hundred eight".