1221312767311 has 32 divisors (see below), whose sum is σ = 1506229724160. Its totient is φ = 964338414336.

The previous prime is 1221312767293. The next prime is 1221312767377. The reversal of 1221312767311 is 1137672131221.

It is a cyclic number.

It is not a de Polignac number, because 1221312767311 - 2¹¹ = 1221312765263 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221312767611) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 94529710 + ... + 94542628.

It is an arithmetic number, because the mean of its divisors is an integer number (47069678880).

Almost surely, 2^{1221312767311} is an apocalyptic number.

1221312767311 is a deficient number, since it is larger than the sum of its proper divisors (284916956849).

1221312767311 is a wasteful number, since it uses less digits than its factorization.

1221312767311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14983.

The product of its digits is 21168, while the sum is 37.

Adding to 1221312767311 its reverse (1137672131221), we get a palindrome (2358984898532).

The spelling of 1221312767311 in words is "one trillion, two hundred twenty-one billion, three hundred twelve million, seven hundred sixty-seven thousand, three hundred eleven".