212221220022 has 96 divisors (see below), whose sum is σ = 549786811392. Its totient is φ = 60097935744.

The previous prime is 212221220021. The next prime is 212221220023. The reversal of 212221220022 is 220022122212.

It is an interprime number because it is at equal distance from previous prime (212221220021) and next prime (212221220023).

It is a super-2 number, since 2×212221220022² (a number of 23 digits) contains 22 as substring.

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 = 212221219977 and 212221220004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212221220021) 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, 108403 + ... + 660449.

It is an arithmetic number, because the mean of its divisors is an integer number (5726945952).

Almost surely, 2^212221220022 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212221220022, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (274893405696).

212221220022 is an abundant number, since it is smaller than the sum of its proper divisors (337565591370).

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

212221220022 is a wasteful number, since it uses less digits than its factorization.

212221220022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 552184 (or 552172 counting only the distinct ones).

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

Adding to 212221220022 its reverse (220022122212), we get a palindrome (432243342234).

The spelling of 212221220022 in words is "two hundred twelve billion, two hundred twenty-one million, two hundred twenty thousand, twenty-two".