21107196 has 96 divisors (see below), whose sum is σ = 60614400. Its totient is φ = 6298560.

The previous prime is 21107189. The next prime is 21107209. The reversal of 21107196 is 69170112.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

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 31 ways as a sum of consecutive naturals, for example, 129411 + ... + 129573.

It is an arithmetic number, because the mean of its divisors is an integer number (631400).

Almost surely, 2^21107196 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21107196, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30307200).

21107196 is an abundant number, since it is smaller than the sum of its proper divisors (39507204).

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

21107196 is a wasteful number, since it uses less digits than its factorization.

21107196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296 (or 288 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 27.

The square root of 21107196 is about 4594.2568495895. The cubic root of 21107196 is about 276.3610586540.

The spelling of 21107196 in words is "twenty-one million, one hundred seven thousand, one hundred ninety-six".