21033213007 has 2 divisors, whose sum is σ = 21033213008. Its totient is φ = 21033213006.

The previous prime is 21033212999. The next prime is 21033213017. The reversal of 21033213007 is 70031233012.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21033213007 - 2³ = 21033212999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21033213017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10516606503 + 10516606504.

It is an arithmetic number, because the mean of its divisors is an integer number (10516606504).

Almost surely, 2^21033213007 is an apocalyptic number.

21033213007 is a deficient number, since it is larger than the sum of its proper divisors (1).

21033213007 is an equidigital number, since it uses as much as digits as its factorization.

21033213007 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756, while the sum is 22.

Adding to 21033213007 its reverse (70031233012), we get a palindrome (91064446019).

The spelling of 21033213007 in words is "twenty-one billion, thirty-three million, two hundred thirteen thousand, seven".