21232321210 has 64 divisors (see below), whose sum is σ = 40516485120. Its totient is φ = 7988811840.

The previous prime is 21232321199. The next prime is 21232321273. The reversal of 21232321210 is 1212323212.

21232321210 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is a super-2 number, since 2×21232321210² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 20593395 + ... + 20594425.

It is an arithmetic number, because the mean of its divisors is an integer number (633070080).

Almost surely, 2^21232321210 is an apocalyptic number.

21232321210 is a deficient number, since it is larger than the sum of its proper divisors (19284163910).

21232321210 is a wasteful number, since it uses less digits than its factorization.

21232321210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1723.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21232321210 its reverse (1212323212), we get a palindrome (22444644422).

The spelling of 21232321210 in words is "twenty-one billion, two hundred thirty-two million, three hundred twenty-one thousand, two hundred ten".