21350241 has 12 divisors (see below), whose sum is σ = 33642960. Its totient is φ = 12939480.

The previous prime is 21350213. The next prime is 21350291. The reversal of 21350241 is 14205312.

It is not a de Polignac number, because 21350241 - 2⁹ = 21349729 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21350201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 107731 + ... + 107928.

It is an arithmetic number, because the mean of its divisors is an integer number (2803580).

Almost surely, 2^21350241 is an apocalyptic number.

It is an amenable number.

21350241 is a deficient number, since it is larger than the sum of its proper divisors (12292719).

21350241 is a wasteful number, since it uses less digits than its factorization.

21350241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215676 (or 215673 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 21350241 is about 4620.6320996158. The cubic root of 21350241 is about 277.4177599004.

Adding to 21350241 its reverse (14205312), we get a palindrome (35555553).

Subtracting from 21350241 its reverse (14205312), we obtain a square (7144929 = 2673²).

The spelling of 21350241 in words is "twenty-one million, three hundred fifty thousand, two hundred forty-one".