21212311320210 has 32 divisors (see below), whose sum is σ = 50982171394752. Its totient is φ = 5648546993600.

The previous prime is 21212311320181. The next prime is 21212311320217. The reversal of 21212311320210 is 1202311321212.

It is not an unprimeable number, because it can be changed into a prime (21212311320217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 504313524 + ... + 504355583.

It is an arithmetic number, because the mean of its divisors is an integer number (1593192856086).

Almost surely, 2^{21212311320210} is an apocalyptic number.

21212311320210 is an abundant number, since it is smaller than the sum of its proper divisors (29769860074542).

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

21212311320210 is a wasteful number, since it uses less digits than its factorization.

21212311320210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1008669818.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 21212311320210 its reverse (1202311321212), we get a palindrome (22414622641422).

The spelling of 21212311320210 in words is "twenty-one trillion, two hundred twelve billion, three hundred eleven million, three hundred twenty thousand, two hundred ten".