21243002241 has 16 divisors (see below), whose sum is σ = 28431734400. Its totient is φ = 14108236800.

The previous prime is 21243002219. The next prime is 21243002257. The reversal of 21243002241 is 14220034212.

It is not a de Polignac number, because 21243002241 - 2¹¹ = 21243000193 is a prime.

It is a super-2 number, since 2×21243002241² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21243002741) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 867516 + ... + 891666.

It is an arithmetic number, because the mean of its divisors is an integer number (1776983400).

Almost surely, 2^21243002241 is an apocalyptic number.

It is an amenable number.

21243002241 is a deficient number, since it is larger than the sum of its proper divisors (7188732159).

21243002241 is a wasteful number, since it uses less digits than its factorization.

21243002241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25256.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21243002241 its reverse (14220034212), we get a palindrome (35463036453).

The spelling of 21243002241 in words is "twenty-one billion, two hundred forty-three million, two thousand, two hundred forty-one".