1221002001212 has 18 divisors (see below), whose sum is σ = 2485611217152. Its totient is φ = 523286571864.

The previous prime is 1221002001181. The next prime is 1221002001217. The reversal of 1221002001212 is 2121002001221.

It is a super-3 number, since 3×1221002001212³ (a number of 37 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221002001217) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3114800828 + ... + 3114801219.

It is an arithmetic number, because the mean of its divisors is an integer number (138089512064).

Almost surely, 2^{1221002001212} is an apocalyptic number.

It is an amenable number.

1221002001212 is an abundant number, since it is smaller than the sum of its proper divisors (1264609215940).

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

1221002001212 is a wasteful number, since it uses less digits than its factorization.

1221002001212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6229602065 (or 6229602056 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1221002001212 its reverse (2121002001221), we get a palindrome (3342004002433).

Subtracting 1221002001212 from its reverse (2121002001221), we obtain a palindrome (900000000009).

The spelling of 1221002001212 in words is "one trillion, two hundred twenty-one billion, two million, one thousand, two hundred twelve".