20021222001222 has 120 divisors (see below), whose sum is σ = 48590236054800. Its totient is φ = 6158922868800.

The previous prime is 20021222001167. The next prime is 20021222001223. The reversal of 20021222001222 is 22210022212002.

20021222001222 is a `hidden beast` number, since 200 + 21 + 2 + 220 + 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 = 20021222001195 and 20021222001204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021222001223) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 118982847 + ... + 119150997.

It is an arithmetic number, because the mean of its divisors is an integer number (404918633790).

Almost surely, 2^{20021222001222} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20021222001222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24295118027400).

20021222001222 is an abundant number, since it is smaller than the sum of its proper divisors (28569014053578).

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

20021222001222 is a wasteful number, since it uses less digits than its factorization.

20021222001222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172540 (or 172518 counting only the distinct ones).

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

Adding to 20021222001222 its reverse (22210022212002), we get a palindrome (42231244213224).

The spelling of 20021222001222 in words is "twenty trillion, twenty-one billion, two hundred twenty-two million, one thousand, two hundred twenty-two".