1221222201213 has 16 divisors (see below), whose sum is σ = 1862312407040. Its totient is φ = 697315363056.

The previous prime is 1221222201191. The next prime is 1221222201217. The reversal of 1221222201213 is 3121022221221.

It is a de Polignac number, because none of the positive numbers 2^k-1221222201213 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221222201213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221222201217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21883753 + ... + 21939486.

It is an arithmetic number, because the mean of its divisors is an integer number (116394525440).

Almost surely, 2^{1221222201213} is an apocalyptic number.

It is an amenable number.

1221222201213 is a deficient number, since it is larger than the sum of its proper divisors (641090205827).

1221222201213 is a wasteful number, since it uses less digits than its factorization.

1221222201213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43824576.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 1221222201213 its reverse (3121022221221), we get a palindrome (4342244422434).

The spelling of 1221222201213 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-two million, two hundred one thousand, two hundred thirteen".