21255033 has 8 divisors (see below), whose sum is σ = 28388448. Its totient is φ = 14145824.

The previous prime is 21255019. The next prime is 21255061. The reversal of 21255033 is 33055212.

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 21255033 - 2²¹ = 19157881 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21255133) 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, 3891 + ... + 7592.

It is an arithmetic number, because the mean of its divisors is an integer number (3548556).

Almost surely, 2^21255033 is an apocalyptic number.

It is an amenable number.

21255033 is a deficient number, since it is larger than the sum of its proper divisors (7133415).

21255033 is a wasteful number, since it uses less digits than its factorization.

21255033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12103.

The product of its (nonzero) digits is 900, while the sum is 21.

The square root of 21255033 is about 4610.3181018233. The cubic root of 21255033 is about 277.0047786409.

The spelling of 21255033 in words is "twenty-one million, two hundred fifty-five thousand, thirty-three".