1221230313211 has 16 divisors (see below), whose sum is σ = 1230415725600. Its totient is φ = 1212087009280.

The previous prime is 1221230313187. The next prime is 1221230313253. The reversal of 1221230313211 is 1123130321221.

It is a cyclic number.

It is not a de Polignac number, because 1221230313211 - 2¹¹ = 1221230311163 is a prime.

It is a super-2 number, since 2×1221230313211² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221230316211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87807120 + ... + 87821026.

It is an arithmetic number, because the mean of its divisors is an integer number (76900982850).

Almost surely, 2^{1221230313211} is an apocalyptic number.

1221230313211 is a deficient number, since it is larger than the sum of its proper divisors (9185412389).

1221230313211 is a wasteful number, since it uses less digits than its factorization.

1221230313211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15374.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 1221230313211 its reverse (1123130321221), we get a palindrome (2344360634432).

The spelling of 1221230313211 in words is "one trillion, two hundred twenty-one billion, two hundred thirty million, three hundred thirteen thousand, two hundred eleven".