21842241 has 4 divisors (see below), whose sum is σ = 29122992. Its totient is φ = 14561492.

The previous prime is 21842239. The next prime is 21842243. The reversal of 21842241 is 14224812.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (21842239) and next prime (21842243).

It is a cyclic number.

It is not a de Polignac number, because 21842241 - 2¹ = 21842239 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21842243) 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, 3640371 + ... + 3640376.

It is an arithmetic number, because the mean of its divisors is an integer number (7280748).

Almost surely, 2^21842241 is an apocalyptic number.

It is an amenable number.

21842241 is a deficient number, since it is larger than the sum of its proper divisors (7280751).

21842241 is an equidigital number, since it uses as much as digits as its factorization.

21842241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7280750.

The product of its digits is 1024, while the sum is 24.

The square root of 21842241 is about 4673.5683369349. The cubic root of 21842241 is about 279.5325576538.

The spelling of 21842241 in words is "twenty-one million, eight hundred forty-two thousand, two hundred forty-one".