21111201241 has 4 divisors (see below), whose sum is σ = 22735139812. Its totient is φ = 19487262672.

The previous prime is 21111201217. The next prime is 21111201277. The reversal of 21111201241 is 14210211112.

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 7262618841 + 13848582400 = 85221^2 + 117680^2 .

It is a cyclic number.

It is not a de Polignac number, because 21111201241 - 2¹³ = 21111193049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21111201211) 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, 811969266 + ... + 811969291.

It is an arithmetic number, because the mean of its divisors is an integer number (5683784953).

Almost surely, 2^21111201241 is an apocalyptic number.

It is an amenable number.

21111201241 is a deficient number, since it is larger than the sum of its proper divisors (1623938571).

21111201241 is a wasteful number, since it uses less digits than its factorization.

21111201241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1623938570.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21111201241 its reverse (14210211112), we get a palindrome (35321412353).

The spelling of 21111201241 in words is "twenty-one billion, one hundred eleven million, two hundred one thousand, two hundred forty-one".