1221210221012 has 24 divisors (see below), whose sum is σ = 2172215404800. Its totient is φ = 600634715616.

The previous prime is 1221210220969. The next prime is 1221210221093. The reversal of 1221210221012 is 2101220121221.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7098248 + ... + 7268255.

It is an arithmetic number, because the mean of its divisors is an integer number (90508975200).

Almost surely, 2^{1221210221012} is an apocalyptic number.

It is an amenable number.

1221210221012 is a deficient number, since it is larger than the sum of its proper divisors (951005183788).

1221210221012 is a wasteful number, since it uses less digits than its factorization.

1221210221012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14366855 (or 14366853 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1221210221012 its reverse (2101220121221), we get a palindrome (3322430342233).

The spelling of 1221210221012 in words is "one trillion, two hundred twenty-one billion, two hundred ten million, two hundred twenty-one thousand, twelve".