21231232210 has 8 divisors (see below), whose sum is σ = 38216217996. Its totient is φ = 8492492880.

The previous prime is 21231232201. The next prime is 21231232213. The reversal of 21231232210 is 1223213212.

It can be written as a sum of positive squares in 2 ways, for example, as 17124601321 + 4106630889 = 130861^2 + 64083^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21231232213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1061561601 + ... + 1061561620.

Almost surely, 2^21231232210 is an apocalyptic number.

21231232210 is a deficient number, since it is larger than the sum of its proper divisors (16984985786).

21231232210 is a wasteful number, since it uses less digits than its factorization.

21231232210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2123123228.

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

Adding to 21231232210 its reverse (1223213212), we get a palindrome (22454445422).

The spelling of 21231232210 in words is "twenty-one billion, two hundred thirty-one million, two hundred thirty-two thousand, two hundred ten".