21000431241 has 6 divisors (see below), whose sum is σ = 30333956250. Its totient is φ = 14000287488.

The previous prime is 21000431213. The next prime is 21000431261. The reversal of 21000431241 is 14213400012.

21000431241 is a `hidden beast` number, since 210 + 0 + 0 + 431 + 24 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 20679878025 + 320553216 = 143805^2 + 17904^2 .

It is not a de Polignac number, because 21000431241 - 2⁵ = 21000431209 is a prime.

It is a super-2 number, since 2×21000431241² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21000431201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1166690616 + ... + 1166690633.

It is an arithmetic number, because the mean of its divisors is an integer number (5055659375).

Almost surely, 2^21000431241 is an apocalyptic number.

It is an amenable number.

21000431241 is a deficient number, since it is larger than the sum of its proper divisors (9333525009).

21000431241 is a wasteful number, since it uses less digits than its factorization.

21000431241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2333381255 (or 2333381252 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21000431241 its reverse (14213400012), we get a palindrome (35213831253).

The spelling of 21000431241 in words is "twenty-one billion, four hundred thirty-one thousand, two hundred forty-one".