1221210120616 has 32 divisors (see below), whose sum is σ = 2425326978240. Its totient is φ = 574481910528.

The previous prime is 1221210120479. The next prime is 1221210120631. The reversal of 1221210120616 is 6160210121221.

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, 1220556 + ... + 1982971.

It is an arithmetic number, because the mean of its divisors is an integer number (75791468070).

Almost surely, 2^{1221210120616} is an apocalyptic number.

It is an amenable number.

1221210120616 is a deficient number, since it is larger than the sum of its proper divisors (1204116857624).

1221210120616 is a wasteful number, since it uses less digits than its factorization.

1221210120616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3206353 (or 3206349 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 25.

Adding to 1221210120616 its reverse (6160210121221), we get a palindrome (7381420241837).

The spelling of 1221210120616 in words is "one trillion, two hundred twenty-one billion, two hundred ten million, one hundred twenty thousand, six hundred sixteen".