21254833 has 4 divisors (see below), whose sum is σ = 21268980. Its totient is φ = 21240688.

The previous prime is 21254819. The next prime is 21254839. The reversal of 21254833 is 33845212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2096704 + 19158129 = 1448^2 + 4377^2 .

It is a cyclic number.

It is not a de Polignac number, because 21254833 - 2¹⁷ = 21123761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21254839) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4510 + ... + 7927.

It is an arithmetic number, because the mean of its divisors is an integer number (5317245).

Almost surely, 2^21254833 is an apocalyptic number.

It is an amenable number.

21254833 is a deficient number, since it is larger than the sum of its proper divisors (14147).

21254833 is a wasteful number, since it uses less digits than its factorization.

21254833 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14146.

The product of its digits is 5760, while the sum is 28.

The square root of 21254833 is about 4610.2964112950. The cubic root of 21254833 is about 277.0039098094.

The spelling of 21254833 in words is "twenty-one million, two hundred fifty-four thousand, eight hundred thirty-three".