21320322212 has 24 divisors (see below), whose sum is σ = 42645645504. Its totient is φ = 9136209312.

The previous prime is 21320322211. The next prime is 21320322241. The reversal of 21320322212 is 21222302312.

It is a happy number.

It is a super-2 number, since 2×21320322212² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21320322211) 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 7 ways as a sum of consecutive naturals, for example, 227438 + ... + 307194.

It is an arithmetic number, because the mean of its divisors is an integer number (1776901896).

Almost surely, 2^21320322212 is an apocalyptic number.

It is an amenable number.

21320322212 is an abundant number, since it is smaller than the sum of its proper divisors (21325323292).

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

21320322212 is a wasteful number, since it uses less digits than its factorization.

21320322212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89315 (or 89313 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21320322212 its reverse (21222302312), we get a palindrome (42542624524).

The spelling of 21320322212 in words is "twenty-one billion, three hundred twenty million, three hundred twenty-two thousand, two hundred twelve".