21213232210 has 8 divisors (see below), whose sum is σ = 38183817996. Its totient is φ = 8485292880.

The previous prime is 21213232177. The next prime is 21213232217. The reversal of 21213232210 is 1223231212.

It can be written as a sum of positive squares in 2 ways, for example, as 18749003329 + 2464228881 = 136927^2 + 49641^2 .

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 (21213232217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1060661601 + ... + 1060661620.

Almost surely, 2^21213232210 is an apocalyptic number.

21213232210 is a deficient number, since it is larger than the sum of its proper divisors (16970585786).

21213232210 is a wasteful number, since it uses less digits than its factorization.

21213232210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2121323228.

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

Adding to 21213232210 its reverse (1223231212), we get a palindrome (22436463422).

The spelling of 21213232210 in words is "twenty-one billion, two hundred thirteen million, two hundred thirty-two thousand, two hundred ten".