21001210011222 has 96 divisors (see below), whose sum is σ = 48998615022720. Its totient is φ = 5983324018560.

The previous prime is 21001210011169. The next prime is 21001210011227. The reversal of 21001210011222 is 22211001210012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001210011227) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 667091722 + ... + 667123202.

It is an arithmetic number, because the mean of its divisors is an integer number (510402239820).

Almost surely, 2^{21001210011222} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21001210011222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24499307511360).

21001210011222 is an abundant number, since it is smaller than the sum of its proper divisors (27997405011498).

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

21001210011222 is a wasteful number, since it uses less digits than its factorization.

21001210011222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37866 (or 37859 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21001210011222 its reverse (22211001210012), we get a palindrome (43212211221234).

The spelling of 21001210011222 in words is "twenty-one trillion, one billion, two hundred ten million, eleven thousand, two hundred twenty-two".