1212220221222 has 64 divisors (see below), whose sum is σ = 2466834289920. Its totient is φ = 397081623936.

The previous prime is 1212220221217. The next prime is 1212220221227. The reversal of 1212220221222 is 2221220222121.

It is an interprime number because it is at equal distance from previous prime (1212220221217) and next prime (1212220221227).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212220221227) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40353304 + ... + 40383332.

It is an arithmetic number, because the mean of its divisors is an integer number (38544285780).

Almost surely, 2^{1212220221222} is an apocalyptic number.

1212220221222 is an abundant number, since it is smaller than the sum of its proper divisors (1254614068698).

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

1212220221222 is a wasteful number, since it uses less digits than its factorization.

1212220221222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30645.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 1212220221222 its reverse (2221220222121), we get a palindrome (3433440443343).

The spelling of 1212220221222 in words is "one trillion, two hundred twelve billion, two hundred twenty million, two hundred twenty-one thousand, two hundred twenty-two".