212210121222 has 48 divisors (see below), whose sum is σ = 502016448960. Its totient is φ = 64251111600.

The previous prime is 212210121173. The next prime is 212210121239. The reversal of 212210121222 is 222121012212.

It is a happy number.

212210121222 is a `hidden beast` number, since 212 + 210 + 1 + 21 + 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 = 212210121195 and 212210121204.

It is a congruent number.

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, 225772 + ... + 689487.

It is an arithmetic number, because the mean of its divisors is an integer number (10458676020).

Almost surely, 2^212210121222 is an apocalyptic number.

212210121222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

212210121222 is an abundant number, since it is smaller than the sum of its proper divisors (289806327738).

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

212210121222 is a wasteful number, since it uses less digits than its factorization.

212210121222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 916449 (or 916446 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 212210121222 its reverse (222121012212), we get a palindrome (434331133434).

The spelling of 212210121222 in words is "two hundred twelve billion, two hundred ten million, one hundred twenty-one thousand, two hundred twenty-two".