21148897 has 8 divisors (see below), whose sum is σ = 26367552. Its totient is φ = 16479600.

The previous prime is 21148879. The next prime is 21148921. The reversal of 21148897 is 79884112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21148897 - 2⁷ = 21148769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21148807) by changing a digit.

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, 137254 + ... + 137407.

It is an arithmetic number, because the mean of its divisors is an integer number (3295944).

Almost surely, 2^21148897 is an apocalyptic number.

It is an amenable number.

21148897 is a deficient number, since it is larger than the sum of its proper divisors (5218655).

21148897 is a wasteful number, since it uses less digits than its factorization.

21148897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274679.

The product of its digits is 32256, while the sum is 40.

The square root of 21148897 is about 4598.7929938191. The cubic root of 21148897 is about 276.5429389827.

It can be divided in two parts, 2114 and 8897, that added together give a palindrome (11011).

The spelling of 21148897 in words is "twenty-one million, one hundred forty-eight thousand, eight hundred ninety-seven".