21231133043 has 12 divisors (see below), whose sum is σ = 23499920808. Its totient is φ = 19113441600.

The previous prime is 21231133039. The next prime is 21231133051. The reversal of 21231133043 is 34033113212.

It is not a de Polignac number, because 21231133043 - 2² = 21231133039 is a prime.

It is a super-2 number, since 2×21231133043² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21231133093) 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 11 ways as a sum of consecutive naturals, for example, 1171433 + ... + 1189418.

It is an arithmetic number, because the mean of its divisors is an integer number (1958326734).

Almost surely, 2^21231133043 is an apocalyptic number.

21231133043 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21231133043 is a deficient number, since it is larger than the sum of its proper divisors (2268787765).

21231133043 is a wasteful number, since it uses less digits than its factorization.

21231133043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2360914 (or 2360891 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 21231133043 its reverse (34033113212), we get a palindrome (55264246255).

The spelling of 21231133043 in words is "twenty-one billion, two hundred thirty-one million, one hundred thirty-three thousand, forty-three".