1221617322563 has 32 divisors (see below), whose sum is σ = 1352913408000. Its totient is φ = 1093840394400.

The previous prime is 1221617322547. The next prime is 1221617322571. The reversal of 1221617322563 is 3652237161221.

It is a cyclic number.

It is not a de Polignac number, because 1221617322563 - 2⁴ = 1221617322547 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1221617322563.

It is not an unprimeable number, because it can be changed into a prime (1221617324563) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 197063738 + ... + 197069936.

It is an arithmetic number, because the mean of its divisors is an integer number (42278544000).

Almost surely, 2^{1221617322563} is an apocalyptic number.

1221617322563 is a deficient number, since it is larger than the sum of its proper divisors (131296085437).

1221617322563 is a wasteful number, since it uses less digits than its factorization.

1221617322563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7343.

The product of its digits is 181440, while the sum is 41.

The spelling of 1221617322563 in words is "one trillion, two hundred twenty-one billion, six hundred seventeen million, three hundred twenty-two thousand, five hundred sixty-three".