21148871 has 8 divisors (see below), whose sum is σ = 21461760. Its totient is φ = 20838328.

The previous prime is 21148861. The next prime is 21148879. The reversal of 21148871 is 17884112.

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 21148871 - 2⁶ = 21148807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21148879) 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, 25160 + ... + 25986.

It is an arithmetic number, because the mean of its divisors is an integer number (2682720).

Almost surely, 2^21148871 is an apocalyptic number.

21148871 is a deficient number, since it is larger than the sum of its proper divisors (312889).

21148871 is a wasteful number, since it uses less digits than its factorization.

21148871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1173.

The product of its digits is 3584, while the sum is 32.

The square root of 21148871 is about 4598.7901669896. The cubic root of 21148871 is about 276.5428256574.

The spelling of 21148871 in words is "twenty-one million, one hundred forty-eight thousand, eight hundred seventy-one".