21110211210 has 384 divisors, whose sum is σ = 63440216064. Its totient is φ = 4432721920.

The previous prime is 21110211209. The next prime is 21110211211. The reversal of 21110211210 is 1211201112.

It is an interprime number because it is at equal distance from previous prime (21110211209) and next prime (21110211211).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110211211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 357800161 + ... + 357800219.

It is an arithmetic number, because the mean of its divisors is an integer number (165208896).

Almost surely, 2^21110211210 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21110211210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31720108032).

21110211210 is an abundant number, since it is smaller than the sum of its proper divisors (42330004854).

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

21110211210 is a wasteful number, since it uses less digits than its factorization.

21110211210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226 (or 167 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21110211210 its reverse (1211201112), we get a palindrome (22321412322).

The spelling of 21110211210 in words is "twenty-one billion, one hundred ten million, two hundred eleven thousand, two hundred ten".