21441641 has 8 divisors (see below), whose sum is σ = 24449544. Its totient is φ = 18627840.

The previous prime is 21441617. The next prime is 21441661. The reversal of 21441641 is 14614412.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 547600 + 20894041 = 740^2 + 4571^2 .

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 21441641 - 2⁶ = 21441577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21441661) 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, 48290 + ... + 48731.

It is an arithmetic number, because the mean of its divisors is an integer number (3056193).

Almost surely, 2^21441641 is an apocalyptic number.

It is an amenable number.

21441641 is a deficient number, since it is larger than the sum of its proper divisors (3007903).

21441641 is a wasteful number, since it uses less digits than its factorization.

21441641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97051.

The product of its digits is 768, while the sum is 23.

The square root of 21441641 is about 4630.5119587363. The cubic root of 21441641 is about 277.8130698211.

The spelling of 21441641 in words is "twenty-one million, four hundred forty-one thousand, six hundred forty-one".