21210022020222 has 96 divisors (see below), whose sum is σ = 53061703119360. Its totient is φ = 5997557361600.

The previous prime is 21210022020163. The next prime is 21210022020233. The reversal of 21210022020222 is 22202022001212.

21210022020222 is a `hidden beast` number, since 212 + 10 + 0 + 220 + 2 + 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 = 21210022020195 and 21210022020204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 30954343 + ... + 31632125.

It is an arithmetic number, because the mean of its divisors is an integer number (552726074160).

Almost surely, 2^{21210022020222} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21210022020222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26530851559680).

21210022020222 is an abundant number, since it is smaller than the sum of its proper divisors (31851681099138).

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

21210022020222 is a wasteful number, since it uses less digits than its factorization.

21210022020222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 680358 (or 680355 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 21210022020222 its reverse (22202022001212), we get a palindrome (43412044021434).

The spelling of 21210022020222 in words is "twenty-one trillion, two hundred ten billion, twenty-two million, twenty thousand, two hundred twenty-two".