21463841 has 4 divisors (see below), whose sum is σ = 24530112. Its totient is φ = 18397572.

The previous prime is 21463831. The next prime is 21463847. The reversal of 21463841 is 14836412.

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 a cyclic number.

It is not a de Polignac number, because 21463841 - 2⁶ = 21463777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21463847) 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, 1533125 + ... + 1533138.

It is an arithmetic number, because the mean of its divisors is an integer number (6132528).

Almost surely, 2^21463841 is an apocalyptic number.

It is an amenable number.

21463841 is a deficient number, since it is larger than the sum of its proper divisors (3066271).

21463841 is an equidigital number, since it uses as much as digits as its factorization.

21463841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3066270.

The product of its digits is 4608, while the sum is 29.

The square root of 21463841 is about 4632.9084817207. The cubic root of 21463841 is about 277.9089163850.

The spelling of 21463841 in words is "twenty-one million, four hundred sixty-three thousand, eight hundred forty-one".