1221111002311 has 8 divisors (see below), whose sum is σ = 1228552731648. Its totient is φ = 1213680195000.

The previous prime is 1221111002239. The next prime is 1221111002327. The reversal of 1221111002311 is 1132001111221.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1221111002311 - 2²⁵ = 1221077447879 is a prime.

It is a super-2 number, since 2×1221111002311² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221111002411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2506165 + ... + 2953486.

It is an arithmetic number, because the mean of its divisors is an integer number (153569091456).

Almost surely, 2^{1221111002311} is an apocalyptic number.

1221111002311 is a deficient number, since it is larger than the sum of its proper divisors (7441729337).

1221111002311 is a wasteful number, since it uses less digits than its factorization.

1221111002311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5461013.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 1221111002311 its reverse (1132001111221), we get a palindrome (2353112113532).

The spelling of 1221111002311 in words is "one trillion, two hundred twenty-one billion, one hundred eleven million, two thousand, three hundred eleven".