21222302220042 has 256 divisors, whose sum is σ = 57654274867200. Its totient is φ = 5039058447360.

The previous prime is 21222302220011. The next prime is 21222302220043. The reversal of 21222302220042 is 24002220322212.

It is a super-2 number, since 2×21222302220042² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21222302219994 and 21222302220021.

It is not an unprimeable number, because it can be changed into a prime (21222302220043) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 60276709 + ... + 60627767.

It is an arithmetic number, because the mean of its divisors is an integer number (225212011200).

Almost surely, 2^{21222302220042} is an apocalyptic number.

21222302220042 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 21222302220042, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28827137433600).

21222302220042 is an abundant number, since it is smaller than the sum of its proper divisors (36431972647158).

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

21222302220042 is a wasteful number, since it uses less digits than its factorization.

21222302220042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351321.

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 21222302220042 its reverse (24002220322212), we get a palindrome (45224522542254).

The spelling of 21222302220042 in words is "twenty-one trillion, two hundred twenty-two billion, three hundred two million, two hundred twenty thousand, forty-two".