21143035241 has 4 divisors (see below), whose sum is σ = 21143596500. Its totient is φ = 21142473984.

The previous prime is 21143035231. The next prime is 21143035279. The reversal of 21143035241 is 14253034112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2598042841 + 18544992400 = 50971^2 + 136180^2 .

It is a cyclic number.

It is not a de Polignac number, because 21143035241 - 2¹⁰ = 21143034217 is a prime.

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 21143035241.

It is not an unprimeable number, because it can be changed into a prime (21143035231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 219716 + ... + 300933.

It is an arithmetic number, because the mean of its divisors is an integer number (5285899125).

Almost surely, 2^21143035241 is an apocalyptic number.

It is an amenable number.

21143035241 is a deficient number, since it is larger than the sum of its proper divisors (561259).

21143035241 is an equidigital number, since it uses as much as digits as its factorization.

21143035241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561258.

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 21143035241 its reverse (14253034112), we get a palindrome (35396069353).

The spelling of 21143035241 in words is "twenty-one billion, one hundred forty-three million, thirty-five thousand, two hundred forty-one".