21143241 has 16 divisors (see below), whose sum is σ = 35798400. Its totient is φ = 12081744.

The previous prime is 21143207. The next prime is 21143251. The reversal of 21143241 is 14234112.

It is not a de Polignac number, because 21143241 - 2⁷ = 21143113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21143201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55746 + ... + 56123.

It is an arithmetic number, because the mean of its divisors is an integer number (2237400).

Almost surely, 2^21143241 is an apocalyptic number.

21143241 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21143241 is a deficient number, since it is larger than the sum of its proper divisors (14655159).

21143241 is a wasteful number, since it uses less digits than its factorization.

21143241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111885 (or 111879 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 21143241 is about 4598.1780087335. The cubic root of 21143241 is about 276.5182841695.

Adding to 21143241 its reverse (14234112), we get a palindrome (35377353).

The spelling of 21143241 in words is "twenty-one million, one hundred forty-three thousand, two hundred forty-one".