21113331241 has 4 divisors (see below), whose sum is σ = 21115961092. Its totient is φ = 21110701392.

The previous prime is 21113331223. The next prime is 21113331257. The reversal of 21113331241 is 14213331112.

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 6495554025 + 14617777216 = 80595^2 + 120904^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21113331241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21113331641) 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, 1302846 + ... + 1318951.

It is an arithmetic number, because the mean of its divisors is an integer number (5278990273).

Almost surely, 2^21113331241 is an apocalyptic number.

It is an amenable number.

21113331241 is a deficient number, since it is larger than the sum of its proper divisors (2629851).

21113331241 is an equidigital number, since it uses as much as digits as its factorization.

21113331241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2629850.

The product of its digits is 432, while the sum is 22.

Adding to 21113331241 its reverse (14213331112), we get a palindrome (35326662353).

The spelling of 21113331241 in words is "twenty-one billion, one hundred thirteen million, three hundred thirty-one thousand, two hundred forty-one".