21213331210 has 8 divisors (see below), whose sum is σ = 38183996196. Its totient is φ = 8485332480.

The previous prime is 21213331201. The next prime is 21213331213. The reversal of 21213331210 is 1213331212.

21213331210 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 21181600521 + 31730689 = 145539^2 + 5633^2 .

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 (21213331213) 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, 1060666551 + ... + 1060666570.

Almost surely, 2^21213331210 is an apocalyptic number.

21213331210 is a deficient number, since it is larger than the sum of its proper divisors (16970664986).

21213331210 is a wasteful number, since it uses less digits than its factorization.

21213331210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2121333128.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21213331210 its reverse (1213331212), we get a palindrome (22426662422).

The spelling of 21213331210 in words is "twenty-one billion, two hundred thirteen million, three hundred thirty-one thousand, two hundred ten".