1221101021012 has 12 divisors (see below), whose sum is σ = 2189046952596. Its totient is φ = 595659034560.

The previous prime is 1221101020987. The next prime is 1221101021017. The reversal of 1221101021012 is 2101201011221.

It can be written as a sum of positive squares in 2 ways, for example, as 340138569796 + 880962451216 = 583214^2 + 938596^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221101021017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3722868803 + ... + 3722869130.

It is an arithmetic number, because the mean of its divisors is an integer number (182420579383).

Almost surely, 2^{1221101021012} is an apocalyptic number.

It is an amenable number.

1221101021012 is a deficient number, since it is larger than the sum of its proper divisors (967945931584).

1221101021012 is a wasteful number, since it uses less digits than its factorization.

1221101021012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7445737978 (or 7445737976 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1221101021012 its reverse (2101201011221), we get a palindrome (3322302032233).

The spelling of 1221101021012 in words is "one trillion, two hundred twenty-one billion, one hundred one million, twenty-one thousand, twelve".