1221321030012 has 18 divisors (see below), whose sum is σ = 3087228159288. Its totient is φ = 407107009992.

The previous prime is 1221321029987. The next prime is 1221321030049. The reversal of 1221321030012 is 2100301231221.

1221321030012 is a `hidden beast` number, since 12 + 21 + 321 + 0 + 300 + 12 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

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 5 ways as a sum of consecutive naturals, for example, 16962792048 + ... + 16962792119.

It is an arithmetic number, because the mean of its divisors is an integer number (171512675516).

Almost surely, 2^{1221321030012} is an apocalyptic number.

1221321030012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1221321030012 is an abundant number, since it is smaller than the sum of its proper divisors (1865907129276).

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

1221321030012 is a wasteful number, since it uses less digits than its factorization.

1221321030012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33925584177 (or 33925584172 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 1221321030012 its reverse (2100301231221), we get a palindrome (3321622261233).

The spelling of 1221321030012 in words is "one trillion, two hundred twenty-one billion, three hundred twenty-one million, thirty thousand, twelve".