21243332333131 has 4 divisors (see below), whose sum is σ = 21246358887000. Its totient is φ = 21240305779264.

The previous prime is 21243332333129. The next prime is 21243332333141. The reversal of 21243332333131 is 13133323334212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21243332333131 - 2¹ = 21243332333129 is a prime.

It is a super-2 number, since 2×21243332333131² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21243332333101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1513266406 + ... + 1513280443.

It is an arithmetic number, because the mean of its divisors is an integer number (5311589721750).

Almost surely, 2^{21243332333131} is an apocalyptic number.

21243332333131 is a deficient number, since it is larger than the sum of its proper divisors (3026553869).

21243332333131 is an equidigital number, since it uses as much as digits as its factorization.

21243332333131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3026553868.

The product of its digits is 69984, while the sum is 34.

Adding to 21243332333131 its reverse (13133323334212), we get a palindrome (34376655667343).

The spelling of 21243332333131 in words is "twenty-one trillion, two hundred forty-three billion, three hundred thirty-two million, three hundred thirty-three thousand, one hundred thirty-one".