21083253 has 8 divisors (see below), whose sum is σ = 28132416. Its totient is φ = 14044800.

The previous prime is 21083239. The next prime is 21083263. The reversal of 21083253 is 35238012.

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

It is not a de Polignac number, because 21083253 - 2⁶ = 21083189 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21083233) 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, 5413 + ... + 8453.

It is an arithmetic number, because the mean of its divisors is an integer number (3516552).

Almost surely, 2^21083253 is an apocalyptic number.

It is an amenable number.

21083253 is a deficient number, since it is larger than the sum of its proper divisors (7049163).

21083253 is a wasteful number, since it uses less digits than its factorization.

21083253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5355.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 21083253 is about 4591.6503568978. The cubic root of 21083253 is about 276.2565221667.

The spelling of 21083253 in words is "twenty-one million, eighty-three thousand, two hundred fifty-three".