21148853 has 8 divisors (see below), whose sum is σ = 23364480. Its totient is φ = 18982080.

The previous prime is 21148847. The next prime is 21148861. The reversal of 21148853 is 35884112.

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 21148853 - 2⁸ = 21148597 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 (21148823) 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, 11300 + ... + 13037.

It is an arithmetic number, because the mean of its divisors is an integer number (2920560).

Almost surely, 2^21148853 is an apocalyptic number.

It is an amenable number.

21148853 is a deficient number, since it is larger than the sum of its proper divisors (2215627).

21148853 is a wasteful number, since it uses less digits than its factorization.

21148853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24427.

The product of its digits is 7680, while the sum is 32.

The square root of 21148853 is about 4598.7882099527. The cubic root of 21148853 is about 276.5427472013.

The spelling of 21148853 in words is "twenty-one million, one hundred forty-eight thousand, eight hundred fifty-three".