1221031111304 has 32 divisors (see below), whose sum is σ = 2327984630400. Its totient is φ = 600243981120.

The previous prime is 1221031111199. The next prime is 1221031111357. The reversal of 1221031111304 is 4031111301221.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 569027 + ... + 1663085.

It is an arithmetic number, because the mean of its divisors is an integer number (72749519700).

Almost surely, 2^{1221031111304} is an apocalyptic number.

It is an amenable number.

1221031111304 is a deficient number, since it is larger than the sum of its proper divisors (1106953519096).

1221031111304 is a wasteful number, since it uses less digits than its factorization.

1221031111304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1096413 (or 1096409 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 1221031111304 its reverse (4031111301221), we get a palindrome (5252142412525).

The spelling of 1221031111304 in words is "one trillion, two hundred twenty-one billion, thirty-one million, one hundred eleven thousand, three hundred four".