21243001033 has 8 divisors (see below), whose sum is σ = 22107113280. Its totient is φ = 20387661840.

The previous prime is 21243001027. The next prime is 21243001079. The reversal of 21243001033 is 33010034212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21243001033 - 2¹⁷ = 21242869961 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21243001033.

It is not an unprimeable number, because it can be changed into a prime (21243001133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2188323 + ... + 2198008.

It is an arithmetic number, because the mean of its divisors is an integer number (2763389160).

Almost surely, 2^21243001033 is an apocalyptic number.

It is an amenable number.

21243001033 is a deficient number, since it is larger than the sum of its proper divisors (864112247).

21243001033 is a wasteful number, since it uses less digits than its factorization.

21243001033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4386527.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21243001033 its reverse (33010034212), we get a palindrome (54253035245).

The spelling of 21243001033 in words is "twenty-one billion, two hundred forty-three million, one thousand, thirty-three".