21002242033 has 4 divisors (see below), whose sum is σ = 21315708400. Its totient is φ = 20688775668.

The previous prime is 21002242013. The next prime is 21002242043. The reversal of 21002242033 is 33024220012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21002242033 - 2¹³ = 21002233841 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 21002242033.

It is not an unprimeable number, because it can be changed into a prime (21002242013) 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, 156733083 + ... + 156733216.

It is an arithmetic number, because the mean of its divisors is an integer number (5328927100).

Almost surely, 2^21002242033 is an apocalyptic number.

It is an amenable number.

21002242033 is a deficient number, since it is larger than the sum of its proper divisors (313466367).

21002242033 is an equidigital number, since it uses as much as digits as its factorization.

21002242033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313466366.

The product of its (nonzero) digits is 576, while the sum is 19.

Adding to 21002242033 its reverse (33024220012), we get a palindrome (54026462045).

The spelling of 21002242033 in words is "twenty-one billion, two million, two hundred forty-two thousand, thirty-three".