21033212001 has 4 divisors (see below), whose sum is σ = 28044282672. Its totient is φ = 14022141332.

The previous prime is 21033211987. The next prime is 21033212029. The reversal of 21033212001 is 10021233012.

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 21033212001 - 2¹³ = 21033203809 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21033212801) 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, 3505535331 + ... + 3505535336.

It is an arithmetic number, because the mean of its divisors is an integer number (7011070668).

Almost surely, 2^21033212001 is an apocalyptic number.

It is an amenable number.

21033212001 is a deficient number, since it is larger than the sum of its proper divisors (7011070671).

21033212001 is an equidigital number, since it uses as much as digits as its factorization.

21033212001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7011070670.

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

Adding to 21033212001 its reverse (10021233012), we get a palindrome (31054445013).

The spelling of 21033212001 in words is "twenty-one billion, thirty-three million, two hundred twelve thousand, one".