21026341 has 6 divisors (see below), whose sum is σ = 24459270. Its totient is φ = 18022536.

The previous prime is 21026333. The next prime is 21026351. The reversal of 21026341 is 14362012.

It can be written as a sum of positive squares in only one way, i.e., 14025025 + 7001316 = 3745^2 + 2646^2 .

It is not a de Polignac number, because 21026341 - 2³ = 21026333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21026351) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 214506 + ... + 214603.

It is an arithmetic number, because the mean of its divisors is an integer number (4076545).

Almost surely, 2^21026341 is an apocalyptic number.

It is an amenable number.

21026341 is a deficient number, since it is larger than the sum of its proper divisors (3432929).

21026341 is an equidigital number, since it uses as much as digits as its factorization.

21026341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429123 (or 429116 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 21026341 is about 4585.4488329933. The cubic root of 21026341 is about 276.0077231263.

Adding to 21026341 its reverse (14362012), we get a palindrome (35388353).

The spelling of 21026341 in words is "twenty-one million, twenty-six thousand, three hundred forty-one".