21001201233 has 4 divisors (see below), whose sum is σ = 28001601648. Its totient is φ = 14000800820.

The previous prime is 21001201231. The next prime is 21001201279. The reversal of 21001201233 is 33210210012.

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 21001201233 - 2¹ = 21001201231 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21001201231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3500200203 + ... + 3500200208.

It is an arithmetic number, because the mean of its divisors is an integer number (7000400412).

Almost surely, 2^21001201233 is an apocalyptic number.

It is an amenable number.

21001201233 is a deficient number, since it is larger than the sum of its proper divisors (7000400415).

21001201233 is an equidigital number, since it uses as much as digits as its factorization.

21001201233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7000400414.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21001201233 its reverse (33210210012), we get a palindrome (54211411245).

The spelling of 21001201233 in words is "twenty-one billion, one million, two hundred one thousand, two hundred thirty-three".