21333222007 has 4 divisors (see below), whose sum is σ = 21334694920. Its totient is φ = 21331749096.

The previous prime is 21333221989. The next prime is 21333222017. The reversal of 21333222007 is 70022233312.

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 21333222007 - 2¹⁹ = 21332697719 is a prime.

It is a super-2 number, since 2×21333222007² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21333222017) 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, 714513 + ... + 743770.

It is an arithmetic number, because the mean of its divisors is an integer number (5333673730).

Almost surely, 2^21333222007 is an apocalyptic number.

21333222007 is a deficient number, since it is larger than the sum of its proper divisors (1472913).

21333222007 is a wasteful number, since it uses less digits than its factorization.

21333222007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1472912.

The product of its (nonzero) digits is 3024, while the sum is 25.

Adding to 21333222007 its reverse (70022233312), we get a palindrome (91355455319).

The spelling of 21333222007 in words is "twenty-one billion, three hundred thirty-three million, two hundred twenty-two thousand, seven".