21001241241 has 12 divisors (see below), whose sum is σ = 30336436260. Its totient is φ = 14000222880.

The previous prime is 21001241213. The next prime is 21001241243. The reversal of 21001241241 is 14214210012.

21001241241 is a `hidden beast` number, since 210 + 0 + 1 + 2 + 412 + 41 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 12209366016 + 8791875225 = 110496^2 + 93765^2 .

It is not a de Polignac number, because 21001241241 - 2¹⁹ = 21000716953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21001241243) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 292195 + ... + 356903.

It is an arithmetic number, because the mean of its divisors is an integer number (2528036355).

Almost surely, 2^21001241241 is an apocalyptic number.

It is an amenable number.

21001241241 is a deficient number, since it is larger than the sum of its proper divisors (9335195019).

21001241241 is a wasteful number, since it uses less digits than its factorization.

21001241241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100776 (or 100773 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21001241241 its reverse (14214210012), we get a palindrome (35215451253).

The spelling of 21001241241 in words is "twenty-one billion, one million, two hundred forty-one thousand, two hundred forty-one".