21103233131 has 4 divisors (see below), whose sum is σ = 21340348200. Its totient is φ = 20866118064.

The previous prime is 21103233071. The next prime is 21103233133. The reversal of 21103233131 is 13133230112.

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 21103233131 - 2¹⁰ = 21103232107 is a prime.

It is a super-2 number, since 2×21103233131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21103233133) 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 3 ways as a sum of consecutive naturals, for example, 118557401 + ... + 118557578.

It is an arithmetic number, because the mean of its divisors is an integer number (5335087050).

Almost surely, 2^21103233131 is an apocalyptic number.

21103233131 is a deficient number, since it is larger than the sum of its proper divisors (237115069).

21103233131 is an equidigital number, since it uses as much as digits as its factorization.

21103233131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237115068.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 21103233131 its reverse (13133230112), we get a palindrome (34236463243).

The spelling of 21103233131 in words is "twenty-one billion, one hundred three million, two hundred thirty-three thousand, one hundred thirty-one".