21258341 has 6 divisors (see below), whose sum is σ = 23019570. Its totient is φ = 19622928.

The previous prime is 21258331. The next prime is 21258361. The reversal of 21258341 is 14385212.

It can be written as a sum of positive squares in 3 ways, for example, as 6241 + 21252100 = 79^2 + 4610^2 .

It is a de Polignac number, because none of the positive numbers 2^k-21258341 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21258341.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21258301) 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, 62726 + ... + 63063.

It is an arithmetic number, because the mean of its divisors is an integer number (3836595).

Almost surely, 2^21258341 is an apocalyptic number.

It is an amenable number.

21258341 is a deficient number, since it is larger than the sum of its proper divisors (1761229).

21258341 is a wasteful number, since it uses less digits than its factorization.

21258341 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125815 (or 125802 counting only the distinct ones).

The product of its digits is 1920, while the sum is 26.

The square root of 21258341 is about 4610.6768483597. The cubic root of 21258341 is about 277.0191483242.

The spelling of 21258341 in words is "twenty-one million, two hundred fifty-eight thousand, three hundred forty-one".