1311210012221 has 16 divisors (see below), whose sum is σ = 1338064220160. Its totient is φ = 1284599136240.

The previous prime is 1311210012193. The next prime is 1311210012227. The reversal of 1311210012221 is 1222100121131.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1311210012221 is a prime.

It is a super-2 number, since 2×1311210012221² (a number of 25 digits) contains 22 as substring.

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 1311210012221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311210012227) 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, 18048656 + ... + 18121158.

It is an arithmetic number, because the mean of its divisors is an integer number (83629013760).

Almost surely, 2^{1311210012221} is an apocalyptic number.

It is an amenable number.

1311210012221 is a deficient number, since it is larger than the sum of its proper divisors (26854207939).

1311210012221 is a wasteful number, since it uses less digits than its factorization.

1311210012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74176.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 1311210012221 its reverse (1222100121131), we get a palindrome (2533310133352).

The spelling of 1311210012221 in words is "one trillion, three hundred eleven billion, two hundred ten million, twelve thousand, two hundred twenty-one".