21000241405 has 32 divisors (see below), whose sum is σ = 30107790720. Its totient is φ = 13859086080.

The previous prime is 21000241403. The next prime is 21000241421. The reversal of 21000241405 is 50414200012.

It is not a de Polignac number, because 21000241405 - 2¹ = 21000241403 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000241403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 206722 + ... + 291091.

It is an arithmetic number, because the mean of its divisors is an integer number (940868460).

Almost surely, 2^21000241405 is an apocalyptic number.

It is an amenable number.

21000241405 is a deficient number, since it is larger than the sum of its proper divisors (9107549315).

21000241405 is a wasteful number, since it uses less digits than its factorization.

21000241405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 497901.

The product of its (nonzero) digits is 320, while the sum is 19.

Adding to 21000241405 its reverse (50414200012), we get a palindrome (71414441417).

The spelling of 21000241405 in words is "twenty-one billion, two hundred forty-one thousand, four hundred five".