21375033 has 8 divisors (see below), whose sum is σ = 28525728. Its totient is φ = 14237184.

The previous prime is 21375031. The next prime is 21375043. The reversal of 21375033 is 33057312.

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

It is not a de Polignac number, because 21375033 - 2¹ = 21375031 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21374994 and 21375012.

It is not an unprimeable number, because it can be changed into a prime (21375031) 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, 1785 + ... + 6777.

It is an arithmetic number, because the mean of its divisors is an integer number (3565716).

Almost surely, 2^21375033 is an apocalyptic number.

It is an amenable number.

21375033 is a deficient number, since it is larger than the sum of its proper divisors (7150695).

21375033 is a wasteful number, since it uses less digits than its factorization.

21375033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6423.

The product of its (nonzero) digits is 1890, while the sum is 24.

The square root of 21375033 is about 4623.3140710966. The cubic root of 21375033 is about 277.5250979654.

The spelling of 21375033 in words is "twenty-one million, three hundred seventy-five thousand, thirty-three".