21143244033 has 24 divisors (see below), whose sum is σ = 30658930848. Its totient is φ = 14040801792.

The previous prime is 21143243951. The next prime is 21143244037. The reversal of 21143244033 is 33044234112.

21143244033 is a `hidden beast` number, since 211 + 4 + 3 + 2 + 440 + 3 + 3 = 666.

It is not a de Polignac number, because 21143244033 - 2¹² = 21143239937 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21143243988 and 21143244006.

It is not an unprimeable number, because it can be changed into a prime (21143244037) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3797910 + ... + 3803472.

It is an arithmetic number, because the mean of its divisors is an integer number (1277455452).

Almost surely, 2^21143244033 is an apocalyptic number.

It is an amenable number.

21143244033 is a deficient number, since it is larger than the sum of its proper divisors (9515686815).

21143244033 is a wasteful number, since it uses less digits than its factorization.

21143244033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7133 (or 7130 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

Adding to 21143244033 its reverse (33044234112), we get a palindrome (54187478145).

The spelling of 21143244033 in words is "twenty-one billion, one hundred forty-three million, two hundred forty-four thousand, thirty-three".