1221110310321 has 12 divisors (see below), whose sum is σ = 1924173822480. Its totient is φ = 740066854680.

The previous prime is 1221110310271. The next prime is 1221110310361. The reversal of 1221110310321 is 1230130111221.

1221110310321 is a `hidden beast` number, since 1 + 2 + 21 + 1 + 10 + 310 + 321 = 666.

It is not a de Polignac number, because 1221110310321 - 2³⁵ = 1186750571953 is a prime.

It is a super-2 number, since 2×1221110310321² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221110310294 and 1221110310303.

It is not an unprimeable number, because it can be changed into a prime (1221110310361) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6167223691 + ... + 6167223888.

It is an arithmetic number, because the mean of its divisors is an integer number (160347818540).

Almost surely, 2^{1221110310321} is an apocalyptic number.

1221110310321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1221110310321 is a deficient number, since it is larger than the sum of its proper divisors (703063512159).

1221110310321 is a wasteful number, since it uses less digits than its factorization.

1221110310321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12334447596 (or 12334447593 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 1221110310321 its reverse (1230130111221), we get a palindrome (2451240421542).

The spelling of 1221110310321 in words is "one trillion, two hundred twenty-one billion, one hundred ten million, three hundred ten thousand, three hundred twenty-one".