1221443351311 has 16 divisors (see below), whose sum is σ = 1236843064800. Its totient is φ = 1206082234368.

The previous prime is 1221443351281. The next prime is 1221443351321. The reversal of 1221443351311 is 1131533441221.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1221443351311 - 2¹¹ = 1221443349263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221443351321) 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, 329316925 + ... + 329320633.

It is an arithmetic number, because the mean of its divisors is an integer number (77302691550).

Almost surely, 2^{1221443351311} is an apocalyptic number.

1221443351311 is a deficient number, since it is larger than the sum of its proper divisors (15399713489).

1221443351311 is a wasteful number, since it uses less digits than its factorization.

1221443351311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7818.

The product of its digits is 8640, while the sum is 31.

Adding to 1221443351311 its reverse (1131533441221), we get a palindrome (2352976792532).

The spelling of 1221443351311 in words is "one trillion, two hundred twenty-one billion, four hundred forty-three million, three hundred fifty-one thousand, three hundred eleven".