1221220212222 has 24 divisors (see below), whose sum is σ = 2465053853976. Its totient is φ = 403338762144.

The previous prime is 1221220212211. The next prime is 1221220212257. The reversal of 1221220212222 is 2222120221221.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8494353 + ... + 8636924.

It is an arithmetic number, because the mean of its divisors is an integer number (102710577249).

Almost surely, 2^{1221220212222} is an apocalyptic number.

1221220212222 is an abundant number, since it is smaller than the sum of its proper divisors (1243833641754).

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

1221220212222 is a wasteful number, since it uses less digits than its factorization.

1221220212222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17131500 (or 17131391 counting only the distinct ones).

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

Adding to 1221220212222 its reverse (2222120221221), we get a palindrome (3443340433443).

The spelling of 1221220212222 in words is "one trillion, two hundred twenty-one billion, two hundred twenty million, two hundred twelve thousand, two hundred twenty-two".