21210212001222 has 192 divisors, whose sum is σ = 48353856595200. Its totient is φ = 6712728422400.

The previous prime is 21210212001217. The next prime is 21210212001241. The reversal of 21210212001222 is 22210021201212.

It is a happy number.

21210212001222 is a `hidden beast` number, since 21 + 210 + 212 + 0 + 0 + 1 + 222 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21210212001195 and 21210212001204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3278743404 + ... + 3278749872.

It is an arithmetic number, because the mean of its divisors is an integer number (251843003100).

Almost surely, 2^{21210212001222} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21210212001222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24176928297600).

21210212001222 is an abundant number, since it is smaller than the sum of its proper divisors (27143644593978).

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

21210212001222 is a wasteful number, since it uses less digits than its factorization.

21210212001222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7311 (or 7308 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21210212001222 its reverse (22210021201212), we get a palindrome (43420233202434).

The spelling of 21210212001222 in words is "twenty-one trillion, two hundred ten billion, two hundred twelve million, one thousand, two hundred twenty-two".