21413441 has 12 divisors (see below), whose sum is σ = 25491312. Its totient is φ = 17925768.

The previous prime is 21413423. The next prime is 21413443. The reversal of 21413441 is 14431412.

It is a de Polignac number, because none of the positive numbers 2^k-21413441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21413443) 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, 2975 + ... + 7188.

It is an arithmetic number, because the mean of its divisors is an integer number (2124276).

Almost surely, 2^21413441 is an apocalyptic number.

It is an amenable number.

21413441 is a deficient number, since it is larger than the sum of its proper divisors (4077871).

21413441 is a wasteful number, since it uses less digits than its factorization.

21413441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10220 (or 10213 counting only the distinct ones).

The product of its digits is 384, while the sum is 20.

The square root of 21413441 is about 4627.4659372058. The cubic root of 21413441 is about 277.6912233380.

Adding to 21413441 its reverse (14431412), we get a palindrome (35844853).

The spelling of 21413441 in words is "twenty-one million, four hundred thirteen thousand, four hundred forty-one".