21011202210222 has 192 divisors, whose sum is σ = 53714865684480. Its totient is φ = 5810279392512.

The previous prime is 21011202210221. The next prime is 21011202210311. The reversal of 21011202210222 is 22201220211012.

It is a happy number.

21011202210222 is a `hidden beast` number, since 2 + 101 + 120 + 221 + 0 + 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 = 21011202210195 and 21011202210204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011202210221) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1485618483 + ... + 1485632625.

It is an arithmetic number, because the mean of its divisors is an integer number (279764925440).

Almost surely, 2^{21011202210222} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21011202210222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26857432842240).

21011202210222 is an abundant number, since it is smaller than the sum of its proper divisors (32703663474258).

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

21011202210222 is a wasteful number, since it uses less digits than its factorization.

21011202210222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15847 (or 15844 counting only the distinct ones).

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

Adding to 21011202210222 its reverse (22201220211012), we get a palindrome (43212422421234).

The spelling of 21011202210222 in words is "twenty-one trillion, eleven billion, two hundred two million, two hundred ten thousand, two hundred twenty-two".