21254841 has 6 divisors (see below), whose sum is σ = 30701450. Its totient is φ = 14169888.

The previous prime is 21254839. The next prime is 21254861. The reversal of 21254841 is 14845212.

It can be written as a sum of positive squares in only one way, i.e., 10989225 + 10265616 = 3315^2 + 3204^2 .

It is not a de Polignac number, because 21254841 - 2¹ = 21254839 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21254861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1180816 + ... + 1180833.

Almost surely, 2^21254841 is an apocalyptic number.

It is an amenable number.

21254841 is a deficient number, since it is larger than the sum of its proper divisors (9446609).

21254841 is a wasteful number, since it uses less digits than its factorization.

21254841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2361655 (or 2361652 counting only the distinct ones).

The product of its digits is 2560, while the sum is 27.

The square root of 21254841 is about 4610.2972789181. The cubic root of 21254841 is about 277.0039445628.

The spelling of 21254841 in words is "twenty-one million, two hundred fifty-four thousand, eight hundred forty-one".