21243001131 has 48 divisors (see below), whose sum is σ = 34579903488. Its totient is φ = 12449764800.

The previous prime is 21243001103. The next prime is 21243001133. The reversal of 21243001131 is 13110034212.

It is not a de Polignac number, because 21243001131 - 2⁹ = 21243000619 is a prime.

It is a super-2 number, since 2×21243001131² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21243001133) 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 47 ways as a sum of consecutive naturals, for example, 7846080 + ... + 7848786.

It is an arithmetic number, because the mean of its divisors is an integer number (720414656).

Almost surely, 2^21243001131 is an apocalyptic number.

21243001131 is a deficient number, since it is larger than the sum of its proper divisors (13336902357).

21243001131 is a wasteful number, since it uses less digits than its factorization.

21243001131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5312 (or 5309 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21243001131 its reverse (13110034212), we get a palindrome (34353035343).

The spelling of 21243001131 in words is "twenty-one billion, two hundred forty-three million, one thousand, one hundred thirty-one".