1220221221012 has 48 divisors (see below), whose sum is σ = 3272623972800. Its totient is φ = 392714874720.

The previous prime is 1220221221007. The next prime is 1220221221047. The reversal of 1220221221012 is 2101221220221.

It is a happy number.

1220221221012 is a `hidden beast` number, since 1 + 220 + 221 + 2 + 210 + 12 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 194795914 + ... + 194802177.

It is an arithmetic number, because the mean of its divisors is an integer number (68179666100).

Almost surely, 2^{1220221221012} is an apocalyptic number.

1220221221012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1220221221012 is an abundant number, since it is smaller than the sum of its proper divisors (2052402751788).

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

1220221221012 is a wasteful number, since it uses less digits than its factorization.

1220221221012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389598133 (or 389598125 counting only the distinct ones).

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

Adding to 1220221221012 its reverse (2101221220221), we get a palindrome (3321442441233).

The spelling of 1220221221012 in words is "one trillion, two hundred twenty billion, two hundred twenty-one million, two hundred twenty-one thousand, twelve".