21230033207 has 4 divisors (see below), whose sum is σ = 21231009240. Its totient is φ = 21229057176.

The previous prime is 21230033179. The next prime is 21230033213. The reversal of 21230033207 is 70233003212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21230033207 - 2¹⁸ = 21229771063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21230033257) 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, 454628 + ... + 499145.

It is an arithmetic number, because the mean of its divisors is an integer number (5307752310).

Almost surely, 2^21230033207 is an apocalyptic number.

21230033207 is a deficient number, since it is larger than the sum of its proper divisors (976033).

21230033207 is an equidigital number, since it uses as much as digits as its factorization.

21230033207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 976032.

The product of its (nonzero) digits is 1512, while the sum is 23.

Adding to 21230033207 its reverse (70233003212), we get a palindrome (91463036419).

The spelling of 21230033207 in words is "twenty-one billion, two hundred thirty million, thirty-three thousand, two hundred seven".