212222212100 has 72 divisors (see below), whose sum is σ = 481234074048. Its totient is φ = 81081616000.

The previous prime is 212222212073. The next prime is 212222212127. The reversal of 212222212100 is 1212222212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (212222212073) and next prime (212222212127).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1546487 + ... + 1678113.

It is an arithmetic number, because the mean of its divisors is an integer number (6683806584).

Almost surely, 2^212222212100 is an apocalyptic number.

212222212100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212222212100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (240617037024).

212222212100 is an abundant number, since it is smaller than the sum of its proper divisors (269011861948).

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

212222212100 is a wasteful number, since it uses less digits than its factorization.

212222212100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132365 (or 132358 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 212222212100 its reverse (1212222212), we get a palindrome (213434434312).

It can be divided in two parts, 21222 and 2212100, that added together give a palindrome (2233322).

The spelling of 212222212100 in words is "two hundred twelve billion, two hundred twenty-two million, two hundred twelve thousand, one hundred".