1221455216396 has 12 divisors (see below), whose sum is σ = 2147132041152. Its totient is φ = 607988918928.

The previous prime is 1221455216381. The next prime is 1221455216411. The reversal of 1221455216396 is 6936125541221.

It is an interprime number because it is at equal distance from previous prime (1221455216381) and next prime (1221455216411).

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1221455216396.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 684671315 + ... + 684673098.

It is an arithmetic number, because the mean of its divisors is an integer number (178927670096).

Almost surely, 2^{1221455216396} is an apocalyptic number.

It is an amenable number.

1221455216396 is a deficient number, since it is larger than the sum of its proper divisors (925676824756).

1221455216396 is a wasteful number, since it uses less digits than its factorization.

1221455216396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1369344640 (or 1369344638 counting only the distinct ones).

The product of its digits is 777600, while the sum is 47.

The spelling of 1221455216396 in words is "one trillion, two hundred twenty-one billion, four hundred fifty-five million, two hundred sixteen thousand, three hundred ninety-six".