21213320022 has 12 divisors (see below), whose sum is σ = 45962193420. Its totient is φ = 7071106668.

The previous prime is 21213320021. The next prime is 21213320077. The reversal of 21213320022 is 22002331212.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1178517779 = 21213320022 / (2 + 1 + 2 + 1 + 3 + 3 + 2 + 0 + 0 + 2 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 21213319977 and 21213320004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213320021) 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 5 ways as a sum of consecutive naturals, for example, 589258872 + ... + 589258907.

It is an arithmetic number, because the mean of its divisors is an integer number (3830182785).

Almost surely, 2^21213320022 is an apocalyptic number.

21213320022 is an abundant number, since it is smaller than the sum of its proper divisors (24748873398).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21213320022 is a wasteful number, since it uses less digits than its factorization.

21213320022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1178517787 (or 1178517784 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21213320022 its reverse (22002331212), we get a palindrome (43215651234).

The spelling of 21213320022 in words is "twenty-one billion, two hundred thirteen million, three hundred twenty thousand, twenty-two".