21375263 has 8 divisors (see below), whose sum is σ = 26308128. Its totient is φ = 16912224.

The previous prime is 21375253. The next prime is 21375293. The reversal of 21375263 is 36257312.

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

It is not a de Polignac number, because 21375263 - 2⁶ = 21375199 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21375223) 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, 117356 + ... + 117537.

It is an arithmetic number, because the mean of its divisors is an integer number (3288516).

Almost surely, 2^21375263 is an apocalyptic number.

21375263 is a deficient number, since it is larger than the sum of its proper divisors (4932865).

21375263 is a wasteful number, since it uses less digits than its factorization.

21375263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234913.

The product of its digits is 7560, while the sum is 29.

The square root of 21375263 is about 4623.3389449617. The cubic root of 21375263 is about 277.5260933719.

The spelling of 21375263 in words is "twenty-one million, three hundred seventy-five thousand, two hundred sixty-three".