21204131241 has 8 divisors (see below), whose sum is σ = 28275063840. Its totient is φ = 14134643072.

The previous prime is 21204131237. The next prime is 21204131269. The reversal of 21204131241 is 14213140212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21204131241 - 2² = 21204131237 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21204131041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 326376 + ... + 385913.

It is an arithmetic number, because the mean of its divisors is an integer number (3534382980).

Almost surely, 2^21204131241 is an apocalyptic number.

It is an amenable number.

21204131241 is a deficient number, since it is larger than the sum of its proper divisors (7070932599).

21204131241 is an equidigital number, since it uses as much as digits as its factorization.

21204131241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 722215.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 21204131241 its reverse (14213140212), we get a palindrome (35417271453).

The spelling of 21204131241 in words is "twenty-one billion, two hundred four million, one hundred thirty-one thousand, two hundred forty-one".