21147896 has 48 divisors (see below), whose sum is σ = 49827120. Its totient is φ = 8236800.

The previous prime is 21147869. The next prime is 21147937. The reversal of 21147896 is 69874112.

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 11 ways as a sum of consecutive naturals, for example, 5216 + ... + 8336.

It is an arithmetic number, because the mean of its divisors is an integer number (1038065).

Almost surely, 2^21147896 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 21147896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24913560).

21147896 is an abundant number, since it is smaller than the sum of its proper divisors (28679224).

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

21147896 is a wasteful number, since it uses less digits than its factorization.

21147896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3156 (or 3141 counting only the distinct ones).

The product of its digits is 24192, while the sum is 38.

The square root of 21147896 is about 4598.6841596265. The cubic root of 21147896 is about 276.5385758892.

The spelling of 21147896 in words is "twenty-one million, one hundred forty-seven thousand, eight hundred ninety-six".