1221555323346 has 16 divisors (see below), whose sum is σ = 2443121781600. Its totient is φ = 407183251968.

The previous prime is 1221555323333. The next prime is 1221555323371. The reversal of 1221555323346 is 6433235551221.

It is a super-2 number, since 2×1221555323346² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221555323298 and 1221555323307.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1849845 + ... + 2421783.

It is an arithmetic number, because the mean of its divisors is an integer number (152695111350).

Almost surely, 2^{1221555323346} is an apocalyptic number.

1221555323346 is an abundant number, since it is smaller than the sum of its proper divisors (1221566458254).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221555323346 is a wasteful number, since it uses less digits than its factorization.

1221555323346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 927913.

The product of its digits is 648000, while the sum is 42.

The spelling of 1221555323346 in words is "one trillion, two hundred twenty-one billion, five hundred fifty-five million, three hundred twenty-three thousand, three hundred forty-six".