21320322210 has 72 divisors (see below), whose sum is σ = 60930340380. Its totient is φ = 5168560320.

The previous prime is 21320322203. The next prime is 21320322211. The reversal of 21320322210 is 1222302312.

21320322210 is a `hidden beast` number, since 2 + 1 + 320 + 322 + 21 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 20672975961 + 647346249 = 143781^2 + 25443^2 .

It is a super-2 number, since 2×21320322210² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

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 35 ways as a sum of consecutive naturals, for example, 968005 + ... + 989784.

Almost surely, 2^21320322210 is an apocalyptic number.

21320322210 is an abundant number, since it is smaller than the sum of its proper divisors (39610018170).

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

21320322210 is a wasteful number, since it uses less digits than its factorization.

21320322210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1957824 (or 1957810 counting only the distinct ones).

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

Adding to 21320322210 its reverse (1222302312), we get a palindrome (22542624522).

The spelling of 21320322210 in words is "twenty-one billion, three hundred twenty million, three hundred twenty-two thousand, two hundred ten".