21311121241 has 8 divisors (see below), whose sum is σ = 21576844800. Its totient is φ = 21047003760.

The previous prime is 21311121233. The next prime is 21311121263. The reversal of 21311121241 is 14212111312.

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 21311121241 - 2³ = 21311121233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21311121281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 374806 + ... + 427903.

It is an arithmetic number, because the mean of its divisors is an integer number (2697105600).

Almost surely, 2^21311121241 is an apocalyptic number.

It is an amenable number.

21311121241 is a deficient number, since it is larger than the sum of its proper divisors (265723559).

21311121241 is a wasteful number, since it uses less digits than its factorization.

21311121241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 803039.

The product of its digits is 96, while the sum is 19.

Adding to 21311121241 its reverse (14212111312), we get a palindrome (35523232553).

The spelling of 21311121241 in words is "twenty-one billion, three hundred eleven million, one hundred twenty-one thousand, two hundred forty-one".